21399302 has 4 divisors (see below), whose sum is σ = 32098956. Its totient is φ = 10699650.

The previous prime is 21399299. The next prime is 21399307. The reversal of 21399302 is 20399312.

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 (21399307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5349824 + ... + 5349827.

It is an arithmetic number, because the mean of its divisors is an integer number (8024739).

Almost surely, 2^21399302 is an apocalyptic number.

21399302 is a deficient number, since it is larger than the sum of its proper divisors (10699654).

21399302 is a wasteful number, since it uses less digits than its factorization.

21399302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10699653.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 21399302 is about 4625.9379589441. The cubic root of 21399302 is about 277.6300913185.

The spelling of 21399302 in words is "twenty-one million, three hundred ninety-nine thousand, three hundred two".