21000111022120 has 64 divisors (see below), whose sum is σ = 50030361374400. Its totient is φ = 7905815884800.

The previous prime is 21000111022073. The next prime is 21000111022123. The reversal of 21000111022120 is 2122011100012.

It is a super-2 number, since 2×21000111022120² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21000111022120.

It is not an unprimeable number, because it can be changed into a prime (21000111022123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63654151 + ... + 63983209.

It is an arithmetic number, because the mean of its divisors is an integer number (781724396475).

Almost surely, 2^{21000111022120} is an apocalyptic number.

21000111022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000111022120 is an abundant number, since it is smaller than the sum of its proper divisors (29030250352280).

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

21000111022120 is a wasteful number, since it uses less digits than its factorization.

21000111022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422938 (or 422934 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000111022120 its reverse (2122011100012), we get a palindrome (23122122122132).

The spelling of 21000111022120 in words is "twenty-one trillion, one hundred eleven million, twenty-two thousand, one hundred twenty".