21386294 has 4 divisors (see below), whose sum is σ = 32079444. Its totient is φ = 10693146.

The previous prime is 21386293. The next prime is 21386329. The reversal of 21386294 is 49268312.

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 (21386291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5346572 + ... + 5346575.

It is an arithmetic number, because the mean of its divisors is an integer number (8019861).

Almost surely, 2^21386294 is an apocalyptic number.

21386294 is a deficient number, since it is larger than the sum of its proper divisors (10693150).

21386294 is a wasteful number, since it uses less digits than its factorization.

21386294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10693149.

The product of its digits is 20736, while the sum is 35.

The square root of 21386294 is about 4624.5317600812. The cubic root of 21386294 is about 277.5738255544.

The spelling of 21386294 in words is "twenty-one million, three hundred eighty-six thousand, two hundred ninety-four".