21377613667 has 2 divisors, whose sum is σ = 21377613668. Its totient is φ = 21377613666.

The previous prime is 21377613643. The next prime is 21377613743. The reversal of 21377613667 is 76631677312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21377613667 - 2⁷ = 21377613539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21377613667.

It is not a weakly prime, because it can be changed into another prime (21377613637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10688806833 + 10688806834.

It is an arithmetic number, because the mean of its divisors is an integer number (10688806834).

Almost surely, 2^21377613667 is an apocalyptic number.

21377613667 is a deficient number, since it is larger than the sum of its proper divisors (1).

21377613667 is an equidigital number, since it uses as much as digits as its factorization.

21377613667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 49.

The spelling of 21377613667 in words is "twenty-one billion, three hundred seventy-seven million, six hundred thirteen thousand, six hundred sixty-seven".