25313111201621 has 2 divisors, whose sum is σ = 25313111201622. Its totient is φ = 25313111201620.

The previous prime is 25313111201597. The next prime is 25313111201663. The reversal of 25313111201621 is 12610211131352.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15917745987025 + 9395365214596 = 3989705^2 + 3065186^2 .

It is a cyclic number.

It is not a de Polignac number, because 25313111201621 - 2³⁴ = 25295931332437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25313111203621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12656555600810 + 12656555600811.

It is an arithmetic number, because the mean of its divisors is an integer number (12656555600811).

Almost surely, 2^{25313111201621} is an apocalyptic number.

It is an amenable number.

25313111201621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25313111201621 is an equidigital number, since it uses as much as digits as its factorization.

25313111201621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 25313111201621 its reverse (12610211131352), we get a palindrome (37923322332973).

The spelling of 25313111201621 in words is "twenty-five trillion, three hundred thirteen billion, one hundred eleven million, two hundred one thousand, six hundred twenty-one".