1000011212220 has 144 divisors (see below), whose sum is σ = 2926542890880. Its totient is φ = 255063465216.

The previous prime is 1000011212209. The next prime is 1000011212237. The reversal of 1000011212220 is 222121100001.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1000011212196 and 1000011212205.

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, 4743087 + ... + 4949433.

It is an arithmetic number, because the mean of its divisors is an integer number (20323214520).

Almost surely, 2^{1000011212220} is an apocalyptic number.

1000011212220 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 1000011212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1463271445440).

1000011212220 is an abundant number, since it is smaller than the sum of its proper divisors (1926531678660).

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

1000011212220 is a wasteful number, since it uses less digits than its factorization.

1000011212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206492 (or 206453 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1000011212220 its reverse (222121100001), we get a palindrome (1222132312221).

The spelling of 1000011212220 in words is "one trillion, eleven million, two hundred twelve thousand, two hundred twenty".