211139397 has 12 divisors (see below), whose sum is σ = 348547680. Its totient is φ = 120651048.

The previous prime is 211139387. The next prime is 211139447. The reversal of 211139397 is 793931112.

It is a happy number.

It is not a de Polignac number, because 211139397 - 2²⁰ = 210090821 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211139387) 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, 1675647 + ... + 1675772.

It is an arithmetic number, because the mean of its divisors is an integer number (29045640).

Almost surely, 2^211139397 is an apocalyptic number.

It is an amenable number.

211139397 is a deficient number, since it is larger than the sum of its proper divisors (137408283).

211139397 is a wasteful number, since it uses less digits than its factorization.

211139397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351432 (or 3351429 counting only the distinct ones).

The product of its digits is 10206, while the sum is 36.

The square root of 211139397 is about 14530.6364967265. The cubic root of 211139397 is about 595.4652548215.

The spelling of 211139397 in words is "two hundred eleven million, one hundred thirty-nine thousand, three hundred ninety-seven".