21992628677 has 2 divisors, whose sum is σ = 21992628678. Its totient is φ = 21992628676.

The previous prime is 21992628659. The next prime is 21992628719. The reversal of 21992628677 is 77682629912.

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., 19443792481 + 2548836196 = 139441^2 + 50486^2 .

It is a cyclic number.

It is not a de Polignac number, because 21992628677 - 2¹⁰ = 21992627653 is a prime.

It is a super-2 number, since 2×21992628677² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21992628377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10996314338 + 10996314339.

It is an arithmetic number, because the mean of its divisors is an integer number (10996314339).

Almost surely, 2^21992628677 is an apocalyptic number.

It is an amenable number.

21992628677 is a deficient number, since it is larger than the sum of its proper divisors (1).

21992628677 is an equidigital number, since it uses as much as digits as its factorization.

21992628677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 59.

The spelling of 21992628677 in words is "twenty-one billion, nine hundred ninety-two million, six hundred twenty-eight thousand, six hundred seventy-seven".