21012112211020 has 48 divisors (see below), whose sum is σ = 50443657992000. Its totient is φ = 7202068660224.

The previous prime is 21012112211017. The next prime is 21012112211047. The reversal of 21012112211020 is 2011221121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012112210985 and 21012112211003.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21223645 + ... + 22191604.

It is an arithmetic number, because the mean of its divisors is an integer number (1050909541500).

Almost surely, 2^{21012112211020} is an apocalyptic number.

21012112211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012112211020 is an abundant number, since it is smaller than the sum of its proper divisors (29431545780980).

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

21012112211020 is a wasteful number, since it uses less digits than its factorization.

21012112211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43418722 (or 43418720 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21012112211020 its reverse (2011221121012), we get a palindrome (23023333332032).

The spelling of 21012112211020 in words is "twenty-one trillion, twelve billion, one hundred twelve million, two hundred eleven thousand, twenty".