253404332400021 has 8 divisors (see below), whose sum is σ = 368588119854624. Its totient is φ = 153578383272720.

The previous prime is 253404332399993. The next prime is 253404332400049. The reversal of 253404332400021 is 120004233404352.

It is an interprime number because it is at equal distance from previous prime (253404332399993) and next prime (253404332400049).

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

It is not a de Polignac number, because 253404332400021 - 2¹³ = 253404332391829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 7678919163637 = 253404332400021 / (2 + 5 + 3 + 4 + 0 + 4 + 3 + 3 + 2 + 4 + 0 + 0 + 0 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253404332400521) 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, 3839459581786 + ... + 3839459581851.

It is an arithmetic number, because the mean of its divisors is an integer number (46073514981828).

Almost surely, 2^{253404332400021} is an apocalyptic number.

It is an amenable number.

253404332400021 is a deficient number, since it is larger than the sum of its proper divisors (115183787454603).

253404332400021 is a wasteful number, since it uses less digits than its factorization.

253404332400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7678919163651.

The product of its (nonzero) digits is 69120, while the sum is 33.

Adding to 253404332400021 its reverse (120004233404352), we get a palindrome (373408565804373).

The spelling of 253404332400021 in words is "two hundred fifty-three trillion, four hundred four billion, three hundred thirty-two million, four hundred thousand, twenty-one".