21625652677 has 2 divisors, whose sum is σ = 21625652678. Its totient is φ = 21625652676.

The previous prime is 21625652569. The next prime is 21625652753. The reversal of 21625652677 is 77625652612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21519129636 + 106523041 = 146694^2 + 10321^2 .

It is a cyclic number.

It is not a de Polignac number, because 21625652677 - 2¹⁵ = 21625619909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21625652677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21625652777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10812826338 + 10812826339.

It is an arithmetic number, because the mean of its divisors is an integer number (10812826339).

Almost surely, 2^21625652677 is an apocalyptic number.

It is an amenable number.

21625652677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21625652677 is an equidigital number, since it uses as much as digits as its factorization.

21625652677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2116800, while the sum is 49.

The spelling of 21625652677 in words is "twenty-one billion, six hundred twenty-five million, six hundred fifty-two thousand, six hundred seventy-seven".