21210200009960 has 64 divisors (see below), whose sum is σ = 53166151256400. Its totient is φ = 7561408167936.

The previous prime is 21210200009959. The next prime is 21210200010011. The reversal of 21210200009960 is 6990000201212.

It can be written as a sum of positive squares in 8 ways, for example, as 12844812289156 + 8365387720804 = 3583966^2 + 2892298^2 .

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, 703240889 + ... + 703271048.

Almost surely, 2^{21210200009960} is an apocalyptic number.

21210200009960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210200009960 is an abundant number, since it is smaller than the sum of its proper divisors (31955951246440).

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

21210200009960 is a wasteful number, since it uses less digits than its factorization.

21210200009960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406511990 (or 1406511986 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 21210200009960 in words is "twenty-one trillion, two hundred ten billion, two hundred million, nine thousand, nine hundred sixty".