52621521 has 16 divisors (see below), whose sum is σ = 71108928. Its totient is φ = 34611200.

The previous prime is 52621487. The next prime is 52621523. The reversal of 52621521 is 12512625.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 52621521 - 2¹⁰ = 52620497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 52621491 and 52621500.

It is not an unprimeable number, because it can be changed into a prime (52621523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100741 + ... + 101261.

It is an arithmetic number, because the mean of its divisors is an integer number (4444308).

Almost surely, 2^52621521 is an apocalyptic number.

It is an amenable number.

52621521 is a deficient number, since it is larger than the sum of its proper divisors (18487407).

52621521 is a wasteful number, since it uses less digits than its factorization.

52621521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912.

The product of its digits is 1200, while the sum is 24.

The square root of 52621521 is about 7254.0692717950. The cubic root of 52621521 is about 374.7323031701.

The spelling of 52621521 in words is "fifty-two million, six hundred twenty-one thousand, five hundred twenty-one".