21395302 has 4 divisors (see below), whose sum is σ = 32092956. Its totient is φ = 10697650.

The previous prime is 21395291. The next prime is 21395303. The reversal of 21395302 is 20359312.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21395303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5348824 + ... + 5348827.

It is an arithmetic number, because the mean of its divisors is an integer number (8023239).

Almost surely, 2^21395302 is an apocalyptic number.

21395302 is a deficient number, since it is larger than the sum of its proper divisors (10697654).

21395302 is a wasteful number, since it uses less digits than its factorization.

21395302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10697653.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21395302 is about 4625.5055939865. The cubic root of 21395302 is about 277.6127918513.

The spelling of 21395302 in words is "twenty-one million, three hundred ninety-five thousand, three hundred two".