53021231 has 2 divisors, whose sum is σ = 53021232. Its totient is φ = 53021230.

The previous prime is 53021219. The next prime is 53021239. The reversal of 53021231 is 13212035.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53021231 is a prime.

It is a super-2 number, since 2×53021231² = 5622501873510722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53021239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26510615 + 26510616.

It is an arithmetic number, because the mean of its divisors is an integer number (26510616).

Almost surely, 2^53021231 is an apocalyptic number.

53021231 is a deficient number, since it is larger than the sum of its proper divisors (1).

53021231 is an equidigital number, since it uses as much as digits as its factorization.

53021231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 53021231 is about 7281.5678943480. The cubic root of 53021231 is about 375.6787257720.

Adding to 53021231 its reverse (13212035), we get a palindrome (66233266).

The spelling of 53021231 in words is "fifty-three million, twenty-one thousand, two hundred thirty-one".