211666412 has 6 divisors (see below), whose sum is σ = 370416228. Its totient is φ = 105833204.

The previous prime is 211666397. The next prime is 211666451. The reversal of 211666412 is 214666112.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26458298 + ... + 26458305.

It is an arithmetic number, because the mean of its divisors is an integer number (61736038).

Almost surely, 2^211666412 is an apocalyptic number.

It is an amenable number.

211666412 is a deficient number, since it is larger than the sum of its proper divisors (158749816).

211666412 is a wasteful number, since it uses less digits than its factorization.

211666412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52916607 (or 52916605 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 211666412 is about 14548.7598096882. The cubic root of 211666412 is about 595.9602806736.

The spelling of 211666412 in words is "two hundred eleven million, six hundred sixty-six thousand, four hundred twelve".