21598334867 has 2 divisors, whose sum is σ = 21598334868. Its totient is φ = 21598334866.

The previous prime is 21598334827. The next prime is 21598334881. The reversal of 21598334867 is 76843389512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21598334867 - 2²⁴ = 21581557651 is a prime.

It is a super-4 number, since 4×21598334867⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21598334827) 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, 10799167433 + 10799167434.

It is an arithmetic number, because the mean of its divisors is an integer number (10799167434).

Almost surely, 2^21598334867 is an apocalyptic number.

21598334867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21598334867 is an equidigital number, since it uses as much as digits as its factorization.

21598334867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 56.

The spelling of 21598334867 in words is "twenty-one billion, five hundred ninety-eight million, three hundred thirty-four thousand, eight hundred sixty-seven".