253521020 has 12 divisors (see below), whose sum is σ = 532394184. Its totient is φ = 101408400.

The previous prime is 253521011. The next prime is 253521041. The reversal of 253521020 is 20125352.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 12676051 = 253521020 / (2 + 5 + 3 + 5 + 2 + 1 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 253520983 and 253521001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6338006 + ... + 6338045.

It is an arithmetic number, because the mean of its divisors is an integer number (44366182).

Almost surely, 2^253521020 is an apocalyptic number.

253521020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253521020 is an abundant number, since it is smaller than the sum of its proper divisors (278873164).

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

253521020 is a wasteful number, since it uses less digits than its factorization.

253521020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12676060 (or 12676058 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 253521020 is about 15922.3434204893. The cubic root of 253521020 is about 632.9042196314.

Adding to 253521020 its reverse (20125352), we get a palindrome (273646372).

The spelling of 253521020 in words is "two hundred fifty-three million, five hundred twenty-one thousand, twenty".