211999972 has 12 divisors (see below), whose sum is σ = 371104300. Its totient is φ = 105970176.

The previous prime is 211999969. The next prime is 212000003. The reversal of 211999972 is 279999112.

It is a happy number.

211999972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 189778176 + 22221796 = 13776^2 + 4714^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 18904 + ... + 27952.

Almost surely, 2^211999972 is an apocalyptic number.

It is an amenable number.

211999972 is a deficient number, since it is larger than the sum of its proper divisors (159104328).

211999972 is a wasteful number, since it uses less digits than its factorization.

211999972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14910 (or 14908 counting only the distinct ones).

The product of its digits is 183708, while the sum is 49.

The square root of 211999972 is about 14560.2188170371. The cubic root of 211999972 is about 596.2731695233.

The spelling of 211999972 in words is "two hundred eleven million, nine hundred ninety-nine thousand, nine hundred seventy-two".