21201012000020 has 96 divisors (see below), whose sum is σ = 45565815375360. Its totient is φ = 8283064724480.

The previous prime is 21201012000013. The next prime is 21201012000067. The reversal of 21201012000020 is 2000021010212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21201011999965 and 21201012000010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 983201759 + ... + 983223321.

It is an arithmetic number, because the mean of its divisors is an integer number (474643910160).

Almost surely, 2^{21201012000020} is an apocalyptic number.

21201012000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201012000020 is an abundant number, since it is smaller than the sum of its proper divisors (24364803375340).

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

21201012000020 is a wasteful number, since it uses less digits than its factorization.

21201012000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25745 (or 25743 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21201012000020 its reverse (2000021010212), we get a palindrome (23201033010232).

The spelling of 21201012000020 in words is "twenty-one trillion, two hundred one billion, twelve million, twenty", and thus it is an aban number.