253517038421 has 4 divisors (see below), whose sum is σ = 253540391244. Its totient is φ = 253493685600.

The previous prime is 253517038417. The next prime is 253517038471. The reversal of 253517038421 is 124830715352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192006094225 + 61510944196 = 438185^2 + 248014^2 .

It is a cyclic number.

It is not a de Polignac number, because 253517038421 - 2² = 253517038417 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 (253517038471) 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, 11660120 + ... + 11681841.

It is an arithmetic number, because the mean of its divisors is an integer number (63385097811).

Almost surely, 2^253517038421 is an apocalyptic number.

It is an amenable number.

253517038421 is a deficient number, since it is larger than the sum of its proper divisors (23352823).

253517038421 is a wasteful number, since it uses less digits than its factorization.

253517038421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23352822.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 253517038421 in words is "two hundred fifty-three billion, five hundred seventeen million, thirty-eight thousand, four hundred twenty-one".