21714377857 has 2 divisors, whose sum is σ = 21714377858. Its totient is φ = 21714377856.

The previous prime is 21714377843. The next prime is 21714377869. The reversal of 21714377857 is 75877341712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11286087696 + 10428290161 = 106236^2 + 102119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21714377857 is a prime.

It is not a weakly prime, because it can be changed into another prime (21714377807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10857188928 + 10857188929.

It is an arithmetic number, because the mean of its divisors is an integer number (10857188929).

Almost surely, 2^21714377857 is an apocalyptic number.

It is an amenable number.

21714377857 is a deficient number, since it is larger than the sum of its proper divisors (1).

21714377857 is an equidigital number, since it uses as much as digits as its factorization.

21714377857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304960, while the sum is 52.

The spelling of 21714377857 in words is "twenty-one billion, seven hundred fourteen million, three hundred seventy-seven thousand, eight hundred fifty-seven".