211975638839 has 8 divisors (see below), whose sum is σ = 215033622480. Its totient is φ = 208932682816.

The previous prime is 211975638821. The next prime is 211975638851. The reversal of 211975638839 is 938836579112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211975638839 is a prime.

It is a super-2 number, since 2×211975638839² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211975631839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3728489 + ... + 3784914.

It is an arithmetic number, because the mean of its divisors is an integer number (26879202810).

Almost surely, 2^211975638839 is an apocalyptic number.

211975638839 is a deficient number, since it is larger than the sum of its proper divisors (3057983641).

211975638839 is an equidigital number, since it uses as much as digits as its factorization.

211975638839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7513809.

The product of its digits is 19595520, while the sum is 62.

The spelling of 211975638839 in words is "two hundred eleven billion, nine hundred seventy-five million, six hundred thirty-eight thousand, eight hundred thirty-nine".