210021200009979 has 16 divisors (see below), whose sum is σ = 292350023757312. Its totient is φ = 133859363761728.

The previous prime is 210021200009953. The next prime is 210021200010047. The reversal of 210021200009979 is 979900002120012.

It is not a de Polignac number, because 210021200009979 - 2¹³ = 210021200001787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210021200009979.

It is not an unprimeable number, because it can be changed into a prime (210021200009939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763481527 + ... + 763756560.

It is an arithmetic number, because the mean of its divisors is an integer number (18271876484832).

Almost surely, 2^{210021200009979} is an apocalyptic number.

210021200009979 is a deficient number, since it is larger than the sum of its proper divisors (82328823747333).

210021200009979 is a wasteful number, since it uses less digits than its factorization.

210021200009979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527240106.

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 210021200009979 in words is "two hundred ten trillion, twenty-one billion, two hundred million, nine thousand, nine hundred seventy-nine".