21017794 has 16 divisors (see below), whose sum is σ = 36622656. Its totient is φ = 8859600.

The previous prime is 21017761. The next prime is 21017803. The reversal of 21017794 is 49771012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11452 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (2288916).

Almost surely, 2^21017794 is an apocalyptic number.

21017794 is a deficient number, since it is larger than the sum of its proper divisors (15604862).

21017794 is a wasteful number, since it uses less digits than its factorization.

21017794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24681.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 21017794 is about 4584.5167684283. The cubic root of 21017794 is about 275.9703199198.

The spelling of 21017794 in words is "twenty-one million, seventeen thousand, seven hundred ninety-four".