53021431 has 2 divisors, whose sum is σ = 53021432. Its totient is φ = 53021430.

The previous prime is 53021393. The next prime is 53021447. The reversal of 53021431 is 13412035.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 53021431 - 2⁷ = 53021303 is a prime.

It is a super-2 number, since 2×53021431² = 5622544290575522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 53021399 and 53021408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53021231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26510715 + 26510716.

It is an arithmetic number, because the mean of its divisors is an integer number (26510716).

Almost surely, 2^53021431 is an apocalyptic number.

53021431 is a deficient number, since it is larger than the sum of its proper divisors (1).

53021431 is an equidigital number, since it uses as much as digits as its factorization.

53021431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 53021431 is about 7281.5816276411. The cubic root of 53021431 is about 375.6791981341.

Adding to 53021431 its reverse (13412035), we get a palindrome (66433466).

The spelling of 53021431 in words is "fifty-three million, twenty-one thousand, four hundred thirty-one".