21616591419 has 30 divisors (see below), whose sum is σ = 32993394764. Its totient is φ = 14104325880.

The previous prime is 21616591379. The next prime is 21616591421. The reversal of 21616591419 is 91419561612.

21616591419 is a `hidden beast` number, since 2 + 1 + 6 + 16 + 591 + 41 + 9 = 666.

It is not a de Polignac number, because 21616591419 - 2⁷ = 21616591291 is a prime.

It is a super-2 number, since 2×21616591419² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616591429) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 118524 + ... + 239334.

Almost surely, 2^21616591419 is an apocalyptic number.

21616591419 is a deficient number, since it is larger than the sum of its proper divisors (11376803345).

21616591419 is an equidigital number, since it uses as much as digits as its factorization.

21616591419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120917 (or 120861 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The spelling of 21616591419 in words is "twenty-one billion, six hundred sixteen million, five hundred ninety-one thousand, four hundred nineteen".