21485641967 has 2 divisors, whose sum is σ = 21485641968. Its totient is φ = 21485641966.

The previous prime is 21485641871. The next prime is 21485641987. The reversal of 21485641967 is 76914658412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21485641967 - 2²⁴ = 21468864751 is a prime.

It is a super-2 number, since 2×21485641967² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21485641987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10742820983 + 10742820984.

It is an arithmetic number, because the mean of its divisors is an integer number (10742820984).

Almost surely, 2^21485641967 is an apocalyptic number.

21485641967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21485641967 is an equidigital number, since it uses as much as digits as its factorization.

21485641967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 53.

The spelling of 21485641967 in words is "twenty-one billion, four hundred eighty-five million, six hundred forty-one thousand, nine hundred sixty-seven".