2121023003220 has 144 divisors (see below), whose sum is σ = 7020438384960. Its totient is φ = 514056960000.

The previous prime is 2121023003213. The next prime is 2121023003251. The reversal of 2121023003220 is 223003201212.

2121023003220 is a `hidden beast` number, since 2 + 1 + 210 + 230 + 0 + 3 + 220 = 666.

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 = 2121023003193 and 2121023003202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7788111 + ... + 8055849.

It is an arithmetic number, because the mean of its divisors is an integer number (48753044340).

Almost surely, 2^{2121023003220} is an apocalyptic number.

2121023003220 is a gapful number since it is divisible by the number (20) 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 2121023003220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3510219192480).

2121023003220 is an abundant number, since it is smaller than the sum of its proper divisors (4899415381740).

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

2121023003220 is a wasteful number, since it uses less digits than its factorization.

2121023003220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271766 (or 271761 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 2121023003220 its reverse (223003201212), we get a palindrome (2344026204432).

The spelling of 2121023003220 in words is "two trillion, one hundred twenty-one billion, twenty-three million, three thousand, two hundred twenty".