25021122613 has 4 divisors (see below), whose sum is σ = 25022550240. Its totient is φ = 25019694988.

The previous prime is 25021122611. The next prime is 25021122661. The reversal of 25021122613 is 31622112052.

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 a cyclic number.

It is not a de Polignac number, because 25021122613 - 2¹ = 25021122611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25021122611) 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, 687193 + ... + 722686.

It is an arithmetic number, because the mean of its divisors is an integer number (6255637560).

Almost surely, 2^25021122613 is an apocalyptic number.

It is an amenable number.

25021122613 is a deficient number, since it is larger than the sum of its proper divisors (1427627).

25021122613 is a wasteful number, since it uses less digits than its factorization.

25021122613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427626.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 25021122613 its reverse (31622112052), we get a palindrome (56643234665).

The spelling of 25021122613 in words is "twenty-five billion, twenty-one million, one hundred twenty-two thousand, six hundred thirteen".