53552021 has 4 divisors (see below), whose sum is σ = 53782092. Its totient is φ = 53321952.

The previous prime is 53552017. The next prime is 53552029. The reversal of 53552021 is 12025535.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12025535 = 5 ⋅2405107.

It can be written as a sum of positive squares in 2 ways, for example, as 14938225 + 38613796 = 3865^2 + 6214^2 .

It is a cyclic number.

It is not a de Polignac number, because 53552021 - 2² = 53552017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53552029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114686 + ... + 115151.

It is an arithmetic number, because the mean of its divisors is an integer number (13445523).

Almost surely, 2^53552021 is an apocalyptic number.

It is an amenable number.

53552021 is a deficient number, since it is larger than the sum of its proper divisors (230071).

53552021 is a wasteful number, since it uses less digits than its factorization.

53552021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230070.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 53552021 is about 7317.9246374912. The cubic root of 53552021 is about 376.9281923899.

Adding to 53552021 its reverse (12025535), we get a palindrome (65577556).

The spelling of 53552021 in words is "fifty-three million, five hundred fifty-two thousand, twenty-one".