25613262021 has 4 divisors (see below), whose sum is σ = 34151016032. Its totient is φ = 17075508012.

The previous prime is 25613262011. The next prime is 25613262043. The reversal of 25613262021 is 12026231652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25613262021 - 2¹⁸ = 25612999877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25613262021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25613262011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4268877001 + ... + 4268877006.

It is an arithmetic number, because the mean of its divisors is an integer number (8537754008).

Almost surely, 2^25613262021 is an apocalyptic number.

It is an amenable number.

25613262021 is a deficient number, since it is larger than the sum of its proper divisors (8537754011).

25613262021 is an equidigital number, since it uses as much as digits as its factorization.

25613262021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8537754010.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 25613262021 its reverse (12026231652), we get a palindrome (37639493673).

The spelling of 25613262021 in words is "twenty-five billion, six hundred thirteen million, two hundred sixty-two thousand, twenty-one".