21695923419 has 4 divisors (see below), whose sum is σ = 28927897896. Its totient is φ = 14463948944.

The previous prime is 21695923411. The next prime is 21695923489. The reversal of 21695923419 is 91432959612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21695923419 - 2³ = 21695923411 is a prime.

It is a super-2 number, since 2×21695923419² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21695923411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3615987234 + ... + 3615987239.

It is an arithmetic number, because the mean of its divisors is an integer number (7231974474).

Almost surely, 2^21695923419 is an apocalyptic number.

21695923419 is a deficient number, since it is larger than the sum of its proper divisors (7231974477).

21695923419 is an equidigital number, since it uses as much as digits as its factorization.

21695923419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7231974476.

The product of its digits is 1049760, while the sum is 51.

The spelling of 21695923419 in words is "twenty-one billion, six hundred ninety-five million, nine hundred twenty-three thousand, four hundred nineteen".