21389795 has 8 divisors (see below), whose sum is σ = 29334624. Its totient is φ = 14667264.

The previous prime is 21389789. The next prime is 21389807. The reversal of 21389795 is 59798312.

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

It is a cyclic number.

It is not a de Polignac number, because 21389795 - 2⁴ = 21389779 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305534 + ... + 305603.

It is an arithmetic number, because the mean of its divisors is an integer number (3666828).

Almost surely, 2^21389795 is an apocalyptic number.

21389795 is a deficient number, since it is larger than the sum of its proper divisors (7944829).

21389795 is an equidigital number, since it uses as much as digits as its factorization.

21389795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611149.

The product of its digits is 136080, while the sum is 44.

The square root of 21389795 is about 4624.9102693998. The cubic root of 21389795 is about 277.5889712818.

The spelling of 21389795 in words is "twenty-one million, three hundred eighty-nine thousand, seven hundred ninety-five".