21348879 has 8 divisors (see below), whose sum is σ = 28491312. Its totient is φ = 14219520.

The previous prime is 21348851. The next prime is 21348883. The reversal of 21348879 is 97884312.

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

It is not a de Polignac number, because 21348879 - 2²³ = 12960271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21348879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1567 + ... + 6719.

It is an arithmetic number, because the mean of its divisors is an integer number (3561414).

Almost surely, 2^21348879 is an apocalyptic number.

21348879 is a deficient number, since it is larger than the sum of its proper divisors (7142433).

21348879 is a wasteful number, since it uses less digits than its factorization.

21348879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537.

The product of its digits is 96768, while the sum is 42.

The square root of 21348879 is about 4620.4847148324. The cubic root of 21348879 is about 277.4118606536.

The spelling of 21348879 in words is "twenty-one million, three hundred forty-eight thousand, eight hundred seventy-nine".