21099294 has 24 divisors (see below), whose sum is σ = 46027800. Its totient is φ = 6985008.

The previous prime is 21099289. The next prime is 21099301. The reversal of 21099294 is 49299012.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 1252 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (1917825).

Almost surely, 2^21099294 is an apocalyptic number.

21099294 is an abundant number, since it is smaller than the sum of its proper divisors (24928506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21099294 is a wasteful number, since it uses less digits than its factorization.

21099294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8024 (or 8021 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 21099294 is about 4593.3967823388. The cubic root of 21099294 is about 276.3265668206.

The spelling of 21099294 in words is "twenty-one million, ninety-nine thousand, two hundred ninety-four".