21460477691 has 2 divisors, whose sum is σ = 21460477692. Its totient is φ = 21460477690.

The previous prime is 21460477667. The next prime is 21460477693. The reversal of 21460477691 is 19677406412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21460477691 - 2¹⁴ = 21460461307 is a prime.

It is a Sophie Germain prime.

Together with 21460477693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21460477693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10730238845 + 10730238846.

It is an arithmetic number, because the mean of its divisors is an integer number (10730238846).

Almost surely, 2^21460477691 is an apocalyptic number.

21460477691 is a deficient number, since it is larger than the sum of its proper divisors (1).

21460477691 is an equidigital number, since it uses as much as digits as its factorization.

21460477691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 21460477691 in words is "twenty-one billion, four hundred sixty million, four hundred seventy-seven thousand, six hundred ninety-one".