211953121 has 2 divisors, whose sum is σ = 211953122. Its totient is φ = 211953120.

The previous prime is 211953103. The next prime is 211953191. The reversal of 211953121 is 121359112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 83448225 = 11336^2 + 9135^2 .

It is a cyclic number.

It is not a de Polignac number, because 211953121 - 2⁵ = 211953089 is a prime.

It is not a weakly prime, because it can be changed into another prime (211953191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105976560 + 105976561.

It is an arithmetic number, because the mean of its divisors is an integer number (105976561).

Almost surely, 2^211953121 is an apocalyptic number.

It is an amenable number.

211953121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211953121 is an equidigital number, since it uses as much as digits as its factorization.

211953121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 25.

The square root of 211953121 is about 14558.6098580874. The cubic root of 211953121 is about 596.2292417622.

The spelling of 211953121 in words is "two hundred eleven million, nine hundred fifty-three thousand, one hundred twenty-one".