21885361872247 has 2 divisors, whose sum is σ = 21885361872248. Its totient is φ = 21885361872246.

The previous prime is 21885361872151. The next prime is 21885361872251. The reversal of 21885361872247 is 74227816358812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21885361872247 - 2²³ = 21885353483639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21885361872047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10942680936123 + 10942680936124.

It is an arithmetic number, because the mean of its divisors is an integer number (10942680936124).

Almost surely, 2^{21885361872247} is an apocalyptic number.

21885361872247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21885361872247 is an equidigital number, since it uses as much as digits as its factorization.

21885361872247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72253440, while the sum is 64.

The spelling of 21885361872247 in words is "twenty-one trillion, eight hundred eighty-five billion, three hundred sixty-one million, eight hundred seventy-two thousand, two hundred forty-seven".