21102012020020 has 96 divisors (see below), whose sum is σ = 46719504155520. Its totient is φ = 7984056107520.

The previous prime is 21102012019997. The next prime is 21102012020081. The reversal of 21102012020020 is 2002021020112.

It is a happy number.

It is a super-2 number, since 2×21102012020020² (a number of 27 digits) contains 22 as substring.

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, 649136607 + ... + 649169113.

It is an arithmetic number, because the mean of its divisors is an integer number (486661501620).

Almost surely, 2^{21102012020020} is an apocalyptic number.

21102012020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102012020020 is an abundant number, since it is smaller than the sum of its proper divisors (25617492135500).

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

21102012020020 is a wasteful number, since it uses less digits than its factorization.

21102012020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35153 (or 35151 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21102012020020 its reverse (2002021020112), we get a palindrome (23104033040132).

The spelling of 21102012020020 in words is "twenty-one trillion, one hundred two billion, twelve million, twenty thousand, twenty".