211963930 has 16 divisors (see below), whose sum is σ = 382958280. Its totient is φ = 84469312.

The previous prime is 211963919. The next prime is 211963949. The reversal of 211963930 is 39369112.

It can be written as a sum of positive squares in 4 ways, for example, as 153487321 + 58476609 = 12389^2 + 7647^2 .

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, 36709 + ... + 42088.

Almost surely, 2^211963930 is an apocalyptic number.

211963930 is a deficient number, since it is larger than the sum of its proper divisors (170994350).

211963930 is a wasteful number, since it uses less digits than its factorization.

211963930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79073.

The product of its (nonzero) digits is 8748, while the sum is 34.

The square root of 211963930 is about 14558.9810769847. The cubic root of 211963930 is about 596.2393769158.

It can be divided in two parts, 2119 and 63930, that added together give a square (66049 = 257²).

The spelling of 211963930 in words is "two hundred eleven million, nine hundred sixty-three thousand, nine hundred thirty".