53266721 has 4 divisors (see below), whose sum is σ = 53686272. Its totient is φ = 52847172.

The previous prime is 53266687. The next prime is 53266727. The reversal of 53266721 is 12766235.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53266721 - 2¹⁰ = 53265697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53266727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209585 + ... + 209838.

It is an arithmetic number, because the mean of its divisors is an integer number (13421568).

Almost surely, 2^53266721 is an apocalyptic number.

It is an amenable number.

53266721 is a deficient number, since it is larger than the sum of its proper divisors (419551).

53266721 is a wasteful number, since it uses less digits than its factorization.

53266721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419550.

The product of its digits is 15120, while the sum is 32.

The square root of 53266721 is about 7298.4053737786. The cubic root of 53266721 is about 376.2576347498.

The spelling of 53266721 in words is "fifty-three million, two hundred sixty-six thousand, seven hundred twenty-one".