53366021 has 4 divisors (see below), whose sum is σ = 53755692. Its totient is φ = 52976352.

The previous prime is 53366017. The next prime is 53366057. The reversal of 53366021 is 12066335.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12066335 = 5 ⋅2413267.

It can be written as a sum of positive squares in 2 ways, for example, as 34093921 + 19272100 = 5839^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 53366021 - 2² = 53366017 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 (53366011) 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, 194630 + ... + 194903.

It is an arithmetic number, because the mean of its divisors is an integer number (13438923).

Almost surely, 2^53366021 is an apocalyptic number.

It is an amenable number.

53366021 is a deficient number, since it is larger than the sum of its proper divisors (389671).

53366021 is a wasteful number, since it uses less digits than its factorization.

53366021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389670.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 53366021 is about 7305.2050621458. The cubic root of 53366021 is about 376.4912965272.

The spelling of 53366021 in words is "fifty-three million, three hundred sixty-six thousand, twenty-one".