21312100023120 has 120 divisors (see below), whose sum is σ = 73881946824192. Its totient is φ = 5499896774400.

The previous prime is 21312100023091. The next prime is 21312100023127. The reversal of 21312100023120 is 2132000121312.

21312100023120 is a `hidden beast` number, since 2 + 1 + 312 + 100 + 0 + 231 + 20 = 666.

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

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 = 21312100023093 and 21312100023102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312100023127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 477399276 + ... + 477443915.

Almost surely, 2^{21312100023120} is an apocalyptic number.

21312100023120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312100023120 is an abundant number, since it is smaller than the sum of its proper divisors (52569846801072).

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

21312100023120 is a wasteful number, since it uses less digits than its factorization.

21312100023120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954843241 (or 954843232 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21312100023120 its reverse (2132000121312), we get a palindrome (23444100144432).

The spelling of 21312100023120 in words is "twenty-one trillion, three hundred twelve billion, one hundred million, twenty-three thousand, one hundred twenty".