25870961021 has 2 divisors, whose sum is σ = 25870961022. Its totient is φ = 25870961020.

The previous prime is 25870960981. The next prime is 25870961047. The reversal of 25870961021 is 12016907852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13274265796 + 12596695225 = 115214^2 + 112235^2 .

It is a cyclic number.

It is not a de Polignac number, because 25870961021 - 2¹⁰ = 25870959997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25870961021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25870960021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12935480510 + 12935480511.

It is an arithmetic number, because the mean of its divisors is an integer number (12935480511).

Almost surely, 2^25870961021 is an apocalyptic number.

It is an amenable number.

25870961021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25870961021 is an equidigital number, since it uses as much as digits as its factorization.

25870961021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 25870961021 in words is "twenty-five billion, eight hundred seventy million, nine hundred sixty-one thousand, twenty-one".