211638136 has 16 divisors (see below), whose sum is σ = 398557800. Its totient is φ = 105356064.

The previous prime is 211638109. The next prime is 211638139. The reversal of 211638136 is 631836112.

It is a junction number, because it is equal to n+sod(n) for n = 211638098 and 211638107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211638139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55930 + ... + 59593.

Almost surely, 2^211638136 is an apocalyptic number.

It is an amenable number.

211638136 is a deficient number, since it is larger than the sum of its proper divisors (186919664).

211638136 is a wasteful number, since it uses less digits than its factorization.

211638136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115758 (or 115754 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 211638136 is about 14547.7880105534. The cubic root of 211638136 is about 595.9337418648.

The spelling of 211638136 in words is "two hundred eleven million, six hundred thirty-eight thousand, one hundred thirty-six".