21103790 has 16 divisors (see below), whose sum is σ = 38217312. Its totient is φ = 8390304.

The previous prime is 21103759. The next prime is 21103843. The reversal of 21103790 is 9730112.

It is a congruent number.

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, 4649 + ... + 7988.

It is an arithmetic number, because the mean of its divisors is an integer number (2388582).

Almost surely, 2^21103790 is an apocalyptic number.

21103790 is a deficient number, since it is larger than the sum of its proper divisors (17113522).

21103790 is a wasteful number, since it uses less digits than its factorization.

21103790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12811.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 21103790 is about 4593.8861544448. The cubic root of 21103790 is about 276.3461926907.

The spelling of 21103790 in words is "twenty-one million, one hundred three thousand, seven hundred ninety".