21093279547 has 2 divisors, whose sum is σ = 21093279548. Its totient is φ = 21093279546.

The previous prime is 21093279527. The next prime is 21093279589. The reversal of 21093279547 is 74597239012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21093279547 - 2²⁷ = 20959061819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21093279547.

It is not a weakly prime, because it can be changed into another prime (21093279517) 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, 10546639773 + 10546639774.

It is an arithmetic number, because the mean of its divisors is an integer number (10546639774).

Almost surely, 2^21093279547 is an apocalyptic number.

21093279547 is a deficient number, since it is larger than the sum of its proper divisors (1).

21093279547 is an equidigital number, since it uses as much as digits as its factorization.

21093279547 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 21093279547 in words is "twenty-one billion, ninety-three million, two hundred seventy-nine thousand, five hundred forty-seven".