21012210011020 has 24 divisors (see below), whose sum is σ = 44230952833200. Its totient is φ = 8384824612032.

The previous prime is 21012210010993. The next prime is 21012210011063. The reversal of 21012210011020 is 2011001221012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1253703435 + ... + 1253720194.

It is an arithmetic number, because the mean of its divisors is an integer number (1842956368050).

Almost surely, 2^{21012210011020} is an apocalyptic number.

21012210011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012210011020 is an abundant number, since it is smaller than the sum of its proper divisors (23218742822180).

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

21012210011020 is a wasteful number, since it uses less digits than its factorization.

21012210011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507424057 (or 2507424055 counting only the distinct ones).

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

Adding to 21012210011020 its reverse (2011001221012), we get a palindrome (23023211232032).

The spelling of 21012210011020 in words is "twenty-one trillion, twelve billion, two hundred ten million, eleven thousand, twenty".