21145685995 has 16 divisors (see below), whose sum is σ = 29038143168. Its totient is φ = 14480726400.

The previous prime is 21145685959. The next prime is 21145686007. The reversal of 21145685995 is 59958654112.

It is not a de Polignac number, because 21145685995 - 2¹³ = 21145677803 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372556 + ... + 425545.

It is an arithmetic number, because the mean of its divisors is an integer number (1814883948).

Almost surely, 2^21145685995 is an apocalyptic number.

21145685995 is a deficient number, since it is larger than the sum of its proper divisors (7892457173).

21145685995 is an equidigital number, since it uses as much as digits as its factorization.

21145685995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798870.

The product of its digits is 3888000, while the sum is 55.

The spelling of 21145685995 in words is "twenty-one billion, one hundred forty-five million, six hundred eighty-five thousand, nine hundred ninety-five".