21622677257 has 4 divisors (see below), whose sum is σ = 21780507156. Its totient is φ = 21464847360.

The previous prime is 21622677233. The next prime is 21622677311. The reversal of 21622677257 is 75277622612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17011724041 + 4610953216 = 130429^2 + 67904^2 .

It is a cyclic number.

It is not a de Polignac number, because 21622677257 - 2⁸ = 21622677001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21622677157) 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, 78914744 + ... + 78915017.

It is an arithmetic number, because the mean of its divisors is an integer number (5445126789).

Almost surely, 2^21622677257 is an apocalyptic number.

It is an amenable number.

21622677257 is a deficient number, since it is larger than the sum of its proper divisors (157829899).

21622677257 is a wasteful number, since it uses less digits than its factorization.

21622677257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157829898.

The product of its digits is 987840, while the sum is 47.

The spelling of 21622677257 in words is "twenty-one billion, six hundred twenty-two million, six hundred seventy-seven thousand, two hundred fifty-seven".