211539138 has 32 divisors (see below), whose sum is σ = 436563456. Its totient is φ = 68283648.

The previous prime is 211539127. The next prime is 211539161. The reversal of 211539138 is 831935112.

211539138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×211539138³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 211539099 and 211539108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47370 + ... + 51642.

It is an arithmetic number, because the mean of its divisors is an integer number (13642608).

Almost surely, 2^211539138 is an apocalyptic number.

211539138 is an abundant number, since it is smaller than the sum of its proper divisors (225024318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211539138 is a wasteful number, since it uses less digits than its factorization.

211539138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538.

The product of its digits is 6480, while the sum is 33.

The square root of 211539138 is about 14544.3851021623. The cubic root of 211539138 is about 595.8408073698.

The spelling of 211539138 in words is "two hundred eleven million, five hundred thirty-nine thousand, one hundred thirty-eight".