25003231021 has 2 divisors, whose sum is σ = 25003231022. Its totient is φ = 25003231020.

The previous prime is 25003230983. The next prime is 25003231063. The reversal of 25003231021 is 12013230052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22401108900 + 2602122121 = 149670^2 + 51011^2 .

It is a cyclic number.

It is not a de Polignac number, because 25003231021 - 2⁹ = 25003230509 is a prime.

It is a super-2 number, since 2×25003231021² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25003231021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25003231921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12501615510 + 12501615511.

It is an arithmetic number, because the mean of its divisors is an integer number (12501615511).

Almost surely, 2^25003231021 is an apocalyptic number.

It is an amenable number.

25003231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25003231021 is an equidigital number, since it uses as much as digits as its factorization.

25003231021 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.

Adding to 25003231021 its reverse (12013230052), we get a palindrome (37016461073).

The spelling of 25003231021 in words is "twenty-five billion, three million, two hundred thirty-one thousand, twenty-one".