215844124139 has 4 divisors (see below), whose sum is σ = 246678999024. Its totient is φ = 185009249256.

The previous prime is 215844124129. The next prime is 215844124141. The reversal of 215844124139 is 931421448512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 215844124139 - 2⁸ = 215844123883 is a prime.

It is a super-3 number, since 3×215844124139³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215844124139.

It is not an unprimeable number, because it can be changed into a prime (215844124129) 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, 15417437432 + ... + 15417437445.

It is an arithmetic number, because the mean of its divisors is an integer number (61669749756).

Almost surely, 2^215844124139 is an apocalyptic number.

215844124139 is a deficient number, since it is larger than the sum of its proper divisors (30834874885).

215844124139 is an equidigital number, since it uses as much as digits as its factorization.

215844124139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30834874884.

The product of its digits is 276480, while the sum is 44.

The spelling of 215844124139 in words is "two hundred fifteen billion, eight hundred forty-four million, one hundred twenty-four thousand, one hundred thirty-nine".