21313021121100 has 108 divisors (see below), whose sum is σ = 67465911436560. Its totient is φ = 5627200272000.

The previous prime is 21313021120981. The next prime is 21313021121143. The reversal of 21313021121100 is 112112031312.

21313021121100 is a `hidden beast` number, since 21 + 313 + 0 + 211 + 21 + 100 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 117142440 + ... + 117324239.

Almost surely, 2^{21313021121100} is an apocalyptic number.

21313021121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313021121100 is an abundant number, since it is smaller than the sum of its proper divisors (46152890315460).

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

21313021121100 is a wasteful number, since it uses less digits than its factorization.

21313021121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234466800 (or 234466790 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 21313021121100 its reverse (112112031312), we get a palindrome (21425133152412).

The spelling of 21313021121100 in words is "twenty-one trillion, three hundred thirteen billion, twenty-one million, one hundred twenty-one thousand, one hundred".