21374405971 has 2 divisors, whose sum is σ = 21374405972. Its totient is φ = 21374405970.

The previous prime is 21374405959. The next prime is 21374405993. The reversal of 21374405971 is 17950447312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21374405971 - 2²³ = 21366017363 is a prime.

It is a super-2 number, since 2×21374405971² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21374405671) 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, 10687202985 + 10687202986.

It is an arithmetic number, because the mean of its divisors is an integer number (10687202986).

Almost surely, 2^21374405971 is an apocalyptic number.

21374405971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374405971 is an equidigital number, since it uses as much as digits as its factorization.

21374405971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 21374405971 in words is "twenty-one billion, three hundred seventy-four million, four hundred five thousand, nine hundred seventy-one".