21221000112020 has 12 divisors (see below), whose sum is σ = 44564100235284. Its totient is φ = 8488400044800.

The previous prime is 21221000112019. The next prime is 21221000112031. The reversal of 21221000112020 is 2021100012212.

It can be written as a sum of positive squares in 2 ways, for example, as 7808514874384 + 13412485237636 = 2794372^2 + 3662306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21221000111986 and 21221000112004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530525002781 + ... + 530525002820.

It is an arithmetic number, because the mean of its divisors is an integer number (3713675019607).

Almost surely, 2^{21221000112020} is an apocalyptic number.

21221000112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221000112020 is an abundant number, since it is smaller than the sum of its proper divisors (23343100123264).

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

21221000112020 is a wasteful number, since it uses less digits than its factorization.

21221000112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061050005610 (or 1061050005608 counting only the distinct ones).

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

Adding to 21221000112020 its reverse (2021100012212), we get a palindrome (23242100124232).

The spelling of 21221000112020 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twelve thousand, twenty".