53221531 has 16 divisors (see below), whose sum is σ = 59885568. Its totient is φ = 46883200.

The previous prime is 53221523. The next prime is 53221537. The reversal of 53221531 is 13512235.

53221531 = T₁₇₀ + T₁₇₁ + ... + T₆₈₆.

It is a cyclic number.

It is not a de Polignac number, because 53221531 - 2³ = 53221523 is a prime.

It is a super-2 number, since 2×53221531² = 5665062723967922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53221537) 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, 57966 + ... + 58876.

It is an arithmetic number, because the mean of its divisors is an integer number (3742848).

Almost surely, 2^53221531 is an apocalyptic number.

53221531 is a deficient number, since it is larger than the sum of its proper divisors (6664037).

53221531 is a wasteful number, since it uses less digits than its factorization.

53221531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082.

The product of its digits is 900, while the sum is 22.

The square root of 53221531 is about 7295.3088351351. The cubic root of 53221531 is about 376.1512024860.

Adding to 53221531 its reverse (13512235), we get a palindrome (66733766).

The spelling of 53221531 in words is "fifty-three million, two hundred twenty-one thousand, five hundred thirty-one".