21210112021320 has 96 divisors (see below), whose sum is σ = 69201085632120. Its totient is φ = 5634021949440.

The previous prime is 21210112021309. The next prime is 21210112021453. The reversal of 21210112021320 is 2312021101212.

21210112021320 is a `hidden beast` number, since 2 + 1 + 210 + 112 + 0 + 21 + 320 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18605367799236 + 2604744222084 = 4313394^2 + 1613922^2 .

It is a super-2 number, since 2×21210112021320² (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 = 21210112021293 and 21210112021302.

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, 114531951 + ... + 114716990.

Almost surely, 2^{21210112021320} is an apocalyptic number.

21210112021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210112021320 is an abundant number, since it is smaller than the sum of its proper divisors (47990973610800).

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

21210112021320 is a wasteful number, since it uses less digits than its factorization.

21210112021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229249215 (or 229249208 counting only the distinct ones).

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

Adding to 21210112021320 its reverse (2312021101212), we get a palindrome (23522133122532).

The spelling of 21210112021320 in words is "twenty-one trillion, two hundred ten billion, one hundred twelve million, twenty-one thousand, three hundred twenty".