253878010821 has 6 divisors (see below), whose sum is σ = 366712682310. Its totient is φ = 169252007208.

The previous prime is 253878010819. The next prime is 253878010823. The reversal of 253878010821 is 128010878352.

253878010821 is a `hidden beast` number, since 2 + 538 + 7 + 8 + 0 + 108 + 2 + 1 = 666.

253878010821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (253878010819) and next prime (253878010823).

It can be written as a sum of positive squares in only one way, i.e., 248976050625 + 4901960196 = 498975^2 + 70014^2 .

It is not a de Polignac number, because 253878010821 - 2¹ = 253878010819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253878010823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14104333926 + ... + 14104333943.

It is an arithmetic number, because the mean of its divisors is an integer number (61118780385).

Almost surely, 2^253878010821 is an apocalyptic number.

It is an amenable number.

253878010821 is a deficient number, since it is larger than the sum of its proper divisors (112834671489).

253878010821 is a wasteful number, since it uses less digits than its factorization.

253878010821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28208667875 (or 28208667872 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 253878010821 in words is "two hundred fifty-three billion, eight hundred seventy-eight million, ten thousand, eight hundred twenty-one".