215124317851 has 4 divisors (see below), whose sum is σ = 215125247304. Its totient is φ = 215123388400.

The previous prime is 215124317831. The next prime is 215124317887. The reversal of 215124317851 is 158713421512.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 215124317851 - 2⁵ = 215124317819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215124317831) 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, 188736 + ... + 682546.

It is an arithmetic number, because the mean of its divisors is an integer number (53781311826).

Almost surely, 2^215124317851 is an apocalyptic number.

215124317851 is a deficient number, since it is larger than the sum of its proper divisors (929453).

215124317851 is an equidigital number, since it uses as much as digits as its factorization.

215124317851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929452.

The product of its digits is 67200, while the sum is 40.

The spelling of 215124317851 in words is "two hundred fifteen billion, one hundred twenty-four million, three hundred seventeen thousand, eight hundred fifty-one".