209911722972 has 24 divisors (see below), whose sum is σ = 559764594816. Its totient is φ = 59974777968.

The previous prime is 209911722929. The next prime is 209911722983. The reversal of 209911722972 is 279227119902.

It is a congruent number.

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, 1249474458 + ... + 1249474625.

It is an arithmetic number, because the mean of its divisors is an integer number (23323524784).

Almost surely, 2^209911722972 is an apocalyptic number.

It is an amenable number.

209911722972 is an abundant number, since it is smaller than the sum of its proper divisors (349852871844).

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

209911722972 is a wasteful number, since it uses less digits than its factorization.

209911722972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498949097 (or 2498949095 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 51.

The spelling of 209911722972 in words is "two hundred nine billion, nine hundred eleven million, seven hundred twenty-two thousand, nine hundred seventy-two".