53988021 has 12 divisors (see below), whose sum is σ = 79885260. Its totient is φ = 35113920.

The previous prime is 53987963. The next prime is 53988049. The reversal of 53988021 is 12088935.

It can be written as a sum of positive squares in 2 ways, for example, as 19236996 + 34751025 = 4386^2 + 5895^2 .

It is not a de Polignac number, because 53988021 - 2⁷ = 53987893 is a prime.

It is a super-2 number, since 2×53988021² = 5829412822992882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53988071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72786 + ... + 73523.

It is an arithmetic number, because the mean of its divisors is an integer number (6657105).

Almost surely, 2^53988021 is an apocalyptic number.

It is an amenable number.

53988021 is a deficient number, since it is larger than the sum of its proper divisors (25897239).

53988021 is a wasteful number, since it uses less digits than its factorization.

53988021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146356 (or 146353 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 53988021 is about 7347.6541154303. The cubic root of 53988021 is about 377.9483636529.

The spelling of 53988021 in words is "fifty-three million, nine hundred eighty-eight thousand, twenty-one".