21001122200120 has 16 divisors (see below), whose sum is σ = 47252524950360. Its totient is φ = 8400448880032.

The previous prime is 21001122200053. The next prime is 21001122200131. The reversal of 21001122200120 is 2100222110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001122200095 and 21001122200104.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 262514027462 + ... + 262514027541.

Almost surely, 2^{21001122200120} is an apocalyptic number.

21001122200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001122200120 is an abundant number, since it is smaller than the sum of its proper divisors (26251402750240).

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

21001122200120 is a wasteful number, since it uses less digits than its factorization.

21001122200120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525028055014 (or 525028055010 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001122200120 its reverse (2100222110012), we get a palindrome (23101344310132).

The spelling of 21001122200120 in words is "twenty-one trillion, one billion, one hundred twenty-two million, two hundred thousand, one hundred twenty".