21514167757 has 2 divisors, whose sum is σ = 21514167758. Its totient is φ = 21514167756.

The previous prime is 21514167751. The next prime is 21514167767. The reversal of 21514167757 is 75776141512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19384714441 + 2129453316 = 139229^2 + 46146^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514167757 - 2⁷ = 21514167629 is a prime.

It is a super-2 number, since 2×21514167757² (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 (21514167751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757083878 + 10757083879.

It is an arithmetic number, because the mean of its divisors is an integer number (10757083879).

Almost surely, 2^21514167757 is an apocalyptic number.

It is an amenable number.

21514167757 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514167757 is an equidigital number, since it uses as much as digits as its factorization.

21514167757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 411600, while the sum is 46.

The spelling of 21514167757 in words is "twenty-one billion, five hundred fourteen million, one hundred sixty-seven thousand, seven hundred fifty-seven".