21012011022020 has 24 divisors (see below), whose sum is σ = 44126466448344. Its totient is φ = 8404567589376.

The previous prime is 21012011022017. The next prime is 21012011022043. The reversal of 21012011022020 is 2022011021012.

It can be written as a sum of positive squares in 4 ways, for example, as 48286546564 + 20963724475456 = 219742^2 + 4578616^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21012011021986 and 21012011022004.

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, 14072789 + ... + 15494108.

It is an arithmetic number, because the mean of its divisors is an integer number (1838602768681).

Almost surely, 2^{21012011022020} is an apocalyptic number.

21012011022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012011022020 is an abundant number, since it is smaller than the sum of its proper divisors (23114455426324).

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

21012011022020 is a wasteful number, since it uses less digits than its factorization.

21012011022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29602439 (or 29602437 counting only the distinct ones).

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

Adding to 21012011022020 its reverse (2022011021012), we get a palindrome (23034022043032).

The spelling of 21012011022020 in words is "twenty-one trillion, twelve billion, eleven million, twenty-two thousand, twenty".