21310369547 has 2 divisors, whose sum is σ = 21310369548. Its totient is φ = 21310369546.

The previous prime is 21310369519. The next prime is 21310369573. The reversal of 21310369547 is 74596301312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21310369547 - 2²² = 21306175243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310369247) 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, 10655184773 + 10655184774.

It is an arithmetic number, because the mean of its divisors is an integer number (10655184774).

Almost surely, 2^21310369547 is an apocalyptic number.

21310369547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310369547 is an equidigital number, since it uses as much as digits as its factorization.

21310369547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 21310369547 in words is "twenty-one billion, three hundred ten million, three hundred sixty-nine thousand, five hundred forty-seven".