21415793667 has 8 divisors (see below), whose sum is σ = 28568121360. Its totient is φ = 14270330880.

The previous prime is 21415793591. The next prime is 21415793669. The reversal of 21415793667 is 76639751412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21415793667 - 2²⁶ = 21348684803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21415793669) 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 7 ways as a sum of consecutive naturals, for example, 1708942 + ... + 1721427.

It is an arithmetic number, because the mean of its divisors is an integer number (3571015170).

Almost surely, 2^21415793667 is an apocalyptic number.

21415793667 is a deficient number, since it is larger than the sum of its proper divisors (7152327693).

21415793667 is a wasteful number, since it uses less digits than its factorization.

21415793667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432453.

The product of its digits is 1905120, while the sum is 51.

The spelling of 21415793667 in words is "twenty-one billion, four hundred fifteen million, seven hundred ninety-three thousand, six hundred sixty-seven".