21001110012020 has 24 divisors (see below), whose sum is σ = 46423506343200. Its totient is φ = 7958315372832.

The previous prime is 21001110011993. The next prime is 21001110012037. The reversal of 21001110012020 is 2021001110012.

It is a junction number, because it is equal to n+sod(n) for n = 21001110011992 and 21001110012010.

It is a congruent number.

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, 27633039110 + ... + 27633039869.

It is an arithmetic number, because the mean of its divisors is an integer number (1934312764300).

Almost surely, 2^{21001110012020} is an apocalyptic number.

21001110012020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001110012020 is an abundant number, since it is smaller than the sum of its proper divisors (25422396331180).

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

21001110012020 is a wasteful number, since it uses less digits than its factorization.

21001110012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55266079007 (or 55266079005 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21001110012020 its reverse (2021001110012), we get a palindrome (23022111122032).

The spelling of 21001110012020 in words is "twenty-one trillion, one billion, one hundred ten million, twelve thousand, twenty".