21394675 has 6 divisors (see below), whose sum is σ = 26529428. Its totient is φ = 17115720.

The previous prime is 21394673. The next prime is 21394679. The reversal of 21394675 is 57649312.

It is not a de Polignac number, because 21394675 - 2¹ = 21394673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21394673) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427869 + ... + 427918.

Almost surely, 2^21394675 is an apocalyptic number.

21394675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21394675 is a deficient number, since it is larger than the sum of its proper divisors (5134753).

21394675 is an equidigital number, since it uses as much as digits as its factorization.

21394675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855797 (or 855792 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 21394675 is about 4625.4378171153. The cubic root of 21394675 is about 277.6100799644.

The spelling of 21394675 in words is "twenty-one million, three hundred ninety-four thousand, six hundred seventy-five".