21220021232120 has 128 divisors (see below), whose sum is σ = 48574776600000. Its totient is φ = 8341823692800.

The previous prime is 21220021232093. The next prime is 21220021232153. The reversal of 21220021232120 is 2123212002212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21220021232092 and 21220021232101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 934832531 + ... + 934855229.

Almost surely, 2^{21220021232120} is an apocalyptic number.

21220021232120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220021232120 is an abundant number, since it is smaller than the sum of its proper divisors (27354755367880).

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

21220021232120 is a wasteful number, since it uses less digits than its factorization.

21220021232120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24513 (or 24509 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21220021232120 its reverse (2123212002212), we get a palindrome (23343233234332).

The spelling of 21220021232120 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred thirty-two thousand, one hundred twenty".