211853979 has 12 divisors (see below), whose sum is σ = 307144032. Its totient is φ = 140713200.

The previous prime is 211853963. The next prime is 211853981. The reversal of 211853979 is 979358112.

It is not a de Polignac number, because 211853979 - 2⁴ = 211853963 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (211853479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40992 + ... + 45869.

It is an arithmetic number, because the mean of its divisors is an integer number (25595336).

Almost surely, 2^211853979 is an apocalyptic number.

211853979 is a deficient number, since it is larger than the sum of its proper divisors (95290053).

211853979 is a wasteful number, since it uses less digits than its factorization.

211853979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87138 (or 87135 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 211853979 is about 14555.2045330871. The cubic root of 211853979 is about 596.1362643180.

The spelling of 211853979 in words is "two hundred eleven million, eight hundred fifty-three thousand, nine hundred seventy-nine".