21386299 has 8 divisors (see below), whose sum is σ = 23650992. Its totient is φ = 19175040.

The previous prime is 21386293. The next prime is 21386329. The reversal of 21386299 is 99268312.

It is a happy number.

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 21386299 - 2³ = 21386291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21386291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12514 + ... + 14119.

It is an arithmetic number, because the mean of its divisors is an integer number (2956374).

Almost surely, 2^21386299 is an apocalyptic number.

21386299 is a deficient number, since it is larger than the sum of its proper divisors (2264693).

21386299 is a wasteful number, since it uses less digits than its factorization.

21386299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26717.

The product of its digits is 46656, while the sum is 40.

The square root of 21386299 is about 4624.5323006765. The cubic root of 21386299 is about 277.5738471862.

The spelling of 21386299 in words is "twenty-one million, three hundred eighty-six thousand, two hundred ninety-nine".