25283572421 has 2 divisors, whose sum is σ = 25283572422. Its totient is φ = 25283572420.

The previous prime is 25283572409. The next prime is 25283572429. The reversal of 25283572421 is 12427538252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19671465025 + 5612107396 = 140255^2 + 74914^2 .

It is a cyclic number.

It is not a de Polignac number, because 25283572421 - 2⁶ = 25283572357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25283572429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12641786210 + 12641786211.

It is an arithmetic number, because the mean of its divisors is an integer number (12641786211).

Almost surely, 2^25283572421 is an apocalyptic number.

It is an amenable number.

25283572421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25283572421 is an equidigital number, since it uses as much as digits as its factorization.

25283572421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268800, while the sum is 41.

The spelling of 25283572421 in words is "twenty-five billion, two hundred eighty-three million, five hundred seventy-two thousand, four hundred twenty-one".