215104422551 has 4 divisors (see below), whose sum is σ = 215105580432. Its totient is φ = 215103264672.

The previous prime is 215104422539. The next prime is 215104422557. The reversal of 215104422551 is 155224401512.

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 215104422551 - 2⁶ = 215104422487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215104422557) 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, 230291 + ... + 695156.

It is an arithmetic number, because the mean of its divisors is an integer number (53776395108).

Almost surely, 2^215104422551 is an apocalyptic number.

215104422551 is a deficient number, since it is larger than the sum of its proper divisors (1157881).

215104422551 is an equidigital number, since it uses as much as digits as its factorization.

215104422551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157880.

The product of its (nonzero) digits is 16000, while the sum is 32.

The spelling of 215104422551 in words is "two hundred fifteen billion, one hundred four million, four hundred twenty-two thousand, five hundred fifty-one".