215304031553421 has 8 divisors (see below), whose sum is σ = 291778141121824. Its totient is φ = 141182971510320.

The previous prime is 215304031553389. The next prime is 215304031553437. The reversal of 215304031553421 is 124355130403512.

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

It is not a de Polignac number, because 215304031553421 - 2⁵ = 215304031553389 is a prime.

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 215304031553421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215304031553441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588262381111 + ... + 588262381476.

It is an arithmetic number, because the mean of its divisors is an integer number (36472267640228).

Almost surely, 2^{215304031553421} is an apocalyptic number.

It is an amenable number.

215304031553421 is a deficient number, since it is larger than the sum of its proper divisors (76474109568403).

215304031553421 is a wasteful number, since it uses less digits than its factorization.

215304031553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176524762651.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 215304031553421 its reverse (124355130403512), we get a palindrome (339659161956933).

The spelling of 215304031553421 in words is "two hundred fifteen trillion, three hundred four billion, thirty-one million, five hundred fifty-three thousand, four hundred twenty-one".