21310122011220 has 72 divisors (see below), whose sum is σ = 73875089643264. Its totient is φ = 4870885030848.

The previous prime is 21310122011089. The next prime is 21310122011237. The reversal of 21310122011220 is 2211022101312.

21310122011220 is a `hidden beast` number, since 2 + 1 + 310 + 1 + 220 + 112 + 20 = 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 = 21310122011193 and 21310122011202.

It is a congruent number.

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, 8456396364 + ... + 8456398883.

It is an arithmetic number, because the mean of its divisors is an integer number (1026042911712).

Almost surely, 2^{21310122011220} is an apocalyptic number.

21310122011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21310122011220 is an abundant number, since it is smaller than the sum of its proper divisors (52564967632044).

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

21310122011220 is a wasteful number, since it uses less digits than its factorization.

21310122011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16912795269 (or 16912795264 counting only the distinct ones).

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

Adding to 21310122011220 its reverse (2211022101312), we get a palindrome (23521144112532).

The spelling of 21310122011220 in words is "twenty-one trillion, three hundred ten billion, one hundred twenty-two million, eleven thousand, two hundred twenty".