21379246 has 16 divisors (see below), whose sum is σ = 37342944. Its totient is φ = 8989344.

The previous prime is 21379201. The next prime is 21379249. The reversal of 21379246 is 64297312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379249) 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, 13665 + ... + 15148.

It is an arithmetic number, because the mean of its divisors is an integer number (2333934).

Almost surely, 2^21379246 is an apocalyptic number.

21379246 is a deficient number, since it is larger than the sum of its proper divisors (15963698).

21379246 is a wasteful number, since it uses less digits than its factorization.

21379246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28875.

The product of its digits is 18144, while the sum is 34.

The square root of 21379246 is about 4623.7696741944. The cubic root of 21379246 is about 277.5433300843.

The spelling of 21379246 in words is "twenty-one million, three hundred seventy-nine thousand, two hundred forty-six".