21023121100120 has 64 divisors (see below), whose sum is σ = 50110760976480. Its totient is φ = 7910435997696.

The previous prime is 21023121100097. The next prime is 21023121100127. The reversal of 21023121100120 is 2100112132012.

It is a junction number, because it is equal to n+sod(n) for n = 21023121100094 and 21023121100103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21023121100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6809259 + ... + 9402778.

Almost surely, 2^{21023121100120} is an apocalyptic number.

21023121100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21023121100120 is an abundant number, since it is smaller than the sum of its proper divisors (29087639876360).

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

21023121100120 is a wasteful number, since it uses less digits than its factorization.

21023121100120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16213972 (or 16213968 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21023121100120 its reverse (2100112132012), we get a palindrome (23123233232132).

The spelling of 21023121100120 in words is "twenty-one trillion, twenty-three billion, one hundred twenty-one million, one hundred thousand, one hundred twenty".