53555021 has 8 divisors (see below), whose sum is σ = 59233944. Its totient is φ = 48098880.

The previous prime is 53555009. The next prime is 53555023. The reversal of 53555021 is 12055535.

It can be written as a sum of positive squares in 4 ways, for example, as 469225 + 53085796 = 685^2 + 7286^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53555021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53555023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55190 + ... + 56151.

It is an arithmetic number, because the mean of its divisors is an integer number (7404243).

Almost surely, 2^53555021 is an apocalyptic number.

It is an amenable number.

53555021 is a deficient number, since it is larger than the sum of its proper divisors (5678923).

53555021 is a wasteful number, since it uses less digits than its factorization.

53555021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111391.

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 53555021 is about 7318.1296107680. The cubic root of 53555021 is about 376.9352308013.

The spelling of 53555021 in words is "fifty-three million, five hundred fifty-five thousand, twenty-one".