21111220102320 has 120 divisors (see below), whose sum is σ = 71066920219152. Its totient is φ = 5616286502400.

The previous prime is 21111220102283. The next prime is 21111220102337. The reversal of 21111220102320 is 2320102211112.

21111220102320 is a `hidden beast` number, since 2 + 1 + 111 + 220 + 10 + 2 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×21111220102320² (a number of 27 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 = 21111220102293 and 21111220102302.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34520086 + ... + 35126325.

Almost surely, 2^{21111220102320} is an apocalyptic number.

21111220102320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111220102320 is an abundant number, since it is smaller than the sum of its proper divisors (49955700116832).

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

21111220102320 is a wasteful number, since it uses less digits than its factorization.

21111220102320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69646851 (or 69646842 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21111220102320 its reverse (2320102211112), we get a palindrome (23431322313432).

The spelling of 21111220102320 in words is "twenty-one trillion, one hundred eleven billion, two hundred twenty million, one hundred two thousand, three hundred twenty".