253521420 has 24 divisors (see below), whose sum is σ = 709860144. Its totient is φ = 67605696.

The previous prime is 253521403. The next prime is 253521439. The reversal of 253521420 is 24125352.

253521420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×253521420² = 128546220797632800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2112619 + ... + 2112738.

It is an arithmetic number, because the mean of its divisors is an integer number (29577506).

Almost surely, 2^253521420 is an apocalyptic number.

253521420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

253521420 is an abundant number, since it is smaller than the sum of its proper divisors (456338724).

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

253521420 is a wasteful number, since it uses less digits than its factorization.

253521420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4225369 (or 4225367 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 253521420 is about 15922.3559814495. The cubic root of 253521420 is about 632.9045524921.

Adding to 253521420 its reverse (24125352), we get a palindrome (277646772).

The spelling of 253521420 in words is "two hundred fifty-three million, five hundred twenty-one thousand, four hundred twenty".