211858455213 has 6 divisors (see below), whose sum is σ = 306017768654. Its totient is φ = 141238970136.

The previous prime is 211858455203. The next prime is 211858455253. The reversal of 211858455213 is 312554858112.

It is a happy number.

211858455213 is a `hidden beast` number, since 2 + 1 + 1 + 8 + 5 + 84 + 552 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 195715990404 + 16142464809 = 442398^2 + 127053^2 .

It is not a de Polignac number, because 211858455213 - 2⁵ = 211858455181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211858455203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11769914170 + ... + 11769914187.

Almost surely, 2^211858455213 is an apocalyptic number.

It is an amenable number.

211858455213 is a deficient number, since it is larger than the sum of its proper divisors (94159313441).

211858455213 is a wasteful number, since it uses less digits than its factorization.

211858455213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23539828363 (or 23539828360 counting only the distinct ones).

The product of its digits is 384000, while the sum is 45.

The spelling of 211858455213 in words is "two hundred eleven billion, eight hundred fifty-eight million, four hundred fifty-five thousand, two hundred thirteen".