25232443021 has 2 divisors, whose sum is σ = 25232443022. Its totient is φ = 25232443020.

The previous prime is 25232443007. The next prime is 25232443031. The reversal of 25232443021 is 12034423252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24192380521 + 1040062500 = 155539^2 + 32250^2 .

It is a cyclic number.

It is not a de Polignac number, because 25232443021 - 2²⁷ = 25098225293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25232443031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12616221510 + 12616221511.

It is an arithmetic number, because the mean of its divisors is an integer number (12616221511).

Almost surely, 2^25232443021 is an apocalyptic number.

It is an amenable number.

25232443021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25232443021 is an equidigital number, since it uses as much as digits as its factorization.

25232443021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 25232443021 its reverse (12034423252), we get a palindrome (37266866273).

The spelling of 25232443021 in words is "twenty-five billion, two hundred thirty-two million, four hundred forty-three thousand, twenty-one".