1002123311220 has 144 divisors (see below), whose sum is σ = 3061876970880. Its totient is φ = 265292064000.

The previous prime is 1002123311209. The next prime is 1002123311263. The reversal of 1002123311220 is 221133212001.

1002123311220 is a `hidden beast` number, since 1 + 0 + 0 + 212 + 331 + 122 + 0 = 666.

It is a super-2 number, since 2×1002123311220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1002123311193 and 1002123311202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45352375 + ... + 45374465.

It is an arithmetic number, because the mean of its divisors is an integer number (21263034520).

Almost surely, 2^{1002123311220} is an apocalyptic number.

1002123311220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1002123311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530938485440).

1002123311220 is an abundant number, since it is smaller than the sum of its proper divisors (2059753659660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1002123311220 is a wasteful number, since it uses less digits than its factorization.

1002123311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23926 (or 23921 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1002123311220 its reverse (221133212001), we get a palindrome (1223256523221).

The spelling of 1002123311220 in words is "one trillion, two billion, one hundred twenty-three million, three hundred eleven thousand, two hundred twenty".