21110021202020 has 48 divisors (see below), whose sum is σ = 46939410750960. Its totient is φ = 7947190738944.

The previous prime is 21110021202007. The next prime is 21110021202031. The reversal of 21110021202020 is 2020212001112.

It can be written as a sum of positive squares in 8 ways, for example, as 1311739577344 + 19798281624676 = 1145312^2 + 4449526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21110021201986 and 21110021202004.

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, 26272796 + ... + 27064364.

It is an arithmetic number, because the mean of its divisors is an integer number (977904390645).

Almost surely, 2^{21110021202020} is an apocalyptic number.

21110021202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110021202020 is an abundant number, since it is smaller than the sum of its proper divisors (25829389548940).

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

21110021202020 is a wasteful number, since it uses less digits than its factorization.

21110021202020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870032 (or 870030 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21110021202020 its reverse (2020212001112), we get a palindrome (23130233203132).

The spelling of 21110021202020 in words is "twenty-one trillion, one hundred ten billion, twenty-one million, two hundred two thousand, twenty".