53431021 has 24 divisors (see below), whose sum is σ = 67716000. Its totient is φ = 41870304.

The previous prime is 53431009. The next prime is 53431031. The reversal of 53431021 is 12013435.

It is not a de Polignac number, because 53431021 - 2⁵ = 53430989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 53431021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53431031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26010 + ... + 27988.

It is an arithmetic number, because the mean of its divisors is an integer number (2821500).

Almost surely, 2^53431021 is an apocalyptic number.

It is an amenable number.

53431021 is a deficient number, since it is larger than the sum of its proper divisors (14284979).

53431021 is a wasteful number, since it uses less digits than its factorization.

53431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041 (or 2034 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 53431021 is about 7309.6525909239. The cubic root of 53431021 is about 376.6440904143.

Adding to 53431021 its reverse (12013435), we get a palindrome (65444456).

The spelling of 53431021 in words is "fifty-three million, four hundred thirty-one thousand, twenty-one".