211969928 has 16 divisors (see below), whose sum is σ = 418362000. Its totient is φ = 100406736.

The previous prime is 211969913. The next prime is 211969931. The reversal of 211969928 is 829969112.

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, 697118 + ... + 697421.

It is an arithmetic number, because the mean of its divisors is an integer number (26147625).

Almost surely, 2^211969928 is an apocalyptic number.

It is an amenable number.

211969928 is a deficient number, since it is larger than the sum of its proper divisors (206392072).

211969928 is a wasteful number, since it uses less digits than its factorization.

211969928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394564 (or 1394560 counting only the distinct ones).

The product of its digits is 139968, while the sum is 47.

The square root of 211969928 is about 14559.1870652176. The cubic root of 211969928 is about 596.2450008444.

The spelling of 211969928 in words is "two hundred eleven million, nine hundred sixty-nine thousand, nine hundred twenty-eight".