211980388 has 6 divisors (see below), whose sum is σ = 370965686. Its totient is φ = 105990192.

The previous prime is 211980347. The next prime is 211980389. The reversal of 211980388 is 883089112.

It can be written as a sum of positive squares in only one way, i.e., 183656704 + 28323684 = 13552^2 + 5322^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211980388.

It is not an unprimeable number, because it can be changed into a prime (211980389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26497545 + ... + 26497552.

Almost surely, 2^211980388 is an apocalyptic number.

It is an amenable number.

211980388 is a deficient number, since it is larger than the sum of its proper divisors (158985298).

211980388 is a wasteful number, since it uses less digits than its factorization.

211980388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52995101 (or 52995099 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 211980388 is about 14559.5462841395. The cubic root of 211980388 is about 596.2548082421.

The spelling of 211980388 in words is "two hundred eleven million, nine hundred eighty thousand, three hundred eighty-eight".