215431455320 has 32 divisors (see below), whose sum is σ = 493866454320. Its totient is φ = 84546683520.

The previous prime is 215431455289. The next prime is 215431455359. The reversal of 215431455320 is 23554134512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50807186 + ... + 50811425.

Almost surely, 2^215431455320 is an apocalyptic number.

215431455320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215431455320 is an abundant number, since it is smaller than the sum of its proper divisors (278434999000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215431455320 is a wasteful number, since it uses less digits than its factorization.

215431455320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101618675 (or 101618671 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 215431455320 its reverse (23554134512), we get a palindrome (238985589832).

The spelling of 215431455320 in words is "two hundred fifteen billion, four hundred thirty-one million, four hundred fifty-five thousand, three hundred twenty".