21274371757 has 2 divisors, whose sum is σ = 21274371758. Its totient is φ = 21274371756.

The previous prime is 21274371751. The next prime is 21274371791. The reversal of 21274371757 is 75717347212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21271055716 + 3316041 = 145846^2 + 1821^2 .

It is a cyclic number.

It is not a de Polignac number, because 21274371757 - 2¹¹ = 21274369709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21274371751) 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, 10637185878 + 10637185879.

It is an arithmetic number, because the mean of its divisors is an integer number (10637185879).

Almost surely, 2^21274371757 is an apocalyptic number.

It is an amenable number.

21274371757 is a deficient number, since it is larger than the sum of its proper divisors (1).

21274371757 is an equidigital number, since it uses as much as digits as its factorization.

21274371757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576240, while the sum is 46.

The spelling of 21274371757 in words is "twenty-one billion, two hundred seventy-four million, three hundred seventy-one thousand, seven hundred fifty-seven".