53724921 has 4 divisors (see below), whose sum is σ = 71633232. Its totient is φ = 35816612.

The previous prime is 53724899. The next prime is 53724943. The reversal of 53724921 is 12942735.

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 an interprime number because it is at equal distance from previous prime (53724899) and next prime (53724943).

It is a cyclic number.

It is not a de Polignac number, because 53724921 - 2⁵ = 53724889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53724991) 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, 8954151 + ... + 8954156.

It is an arithmetic number, because the mean of its divisors is an integer number (17908308).

Almost surely, 2^53724921 is an apocalyptic number.

It is an amenable number.

53724921 is a deficient number, since it is larger than the sum of its proper divisors (17908311).

53724921 is a wasteful number, since it uses less digits than its factorization.

53724921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17908310.

The product of its digits is 15120, while the sum is 33.

The square root of 53724921 is about 7329.7285761480. The cubic root of 53724921 is about 377.3334112848. Note that the first 3 decimals are identical.

It can be divided in two parts, 53724 and 921, that added together give a palindrome (54645).

The spelling of 53724921 in words is "fifty-three million, seven hundred twenty-four thousand, nine hundred twenty-one".