21163294 has 4 divisors (see below), whose sum is σ = 31744944. Its totient is φ = 10581646.

The previous prime is 21163291. The next prime is 21163309. The reversal of 21163294 is 49236112.

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 (21163291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290822 + ... + 5290825.

It is an arithmetic number, because the mean of its divisors is an integer number (7936236).

Almost surely, 2^21163294 is an apocalyptic number.

21163294 is a deficient number, since it is larger than the sum of its proper divisors (10581650).

21163294 is a wasteful number, since it uses less digits than its factorization.

21163294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10581649.

The product of its digits is 2592, while the sum is 28.

The square root of 21163294 is about 4600.3580295451. The cubic root of 21163294 is about 276.6056764641.

The spelling of 21163294 in words is "twenty-one million, one hundred sixty-three thousand, two hundred ninety-four".