21364108427 has 2 divisors, whose sum is σ = 21364108428. Its totient is φ = 21364108426.

The previous prime is 21364108399. The next prime is 21364108481. The reversal of 21364108427 is 72480146312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21364108427 - 2²² = 21359914123 is a prime.

It is a super-2 number, since 2×21364108427² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21364108127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682054213 + 10682054214.

It is an arithmetic number, because the mean of its divisors is an integer number (10682054214).

Almost surely, 2^21364108427 is an apocalyptic number.

21364108427 is a deficient number, since it is larger than the sum of its proper divisors (1).

21364108427 is an equidigital number, since it uses as much as digits as its factorization.

21364108427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 21364108427 in words is "twenty-one billion, three hundred sixty-four million, one hundred eight thousand, four hundred twenty-seven".