21103799 has 8 divisors (see below), whose sum is σ = 21643968. Its totient is φ = 20567520.

The previous prime is 21103759. The next prime is 21103843. The reversal of 21103799 is 99730112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21103799 - 2²⁴ = 4326583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103729) 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, 12209 + ... + 13829.

It is an arithmetic number, because the mean of its divisors is an integer number (2705496).

Almost surely, 2^21103799 is an apocalyptic number.

21103799 is a deficient number, since it is larger than the sum of its proper divisors (540169).

21103799 is a wasteful number, since it uses less digits than its factorization.

21103799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1945.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 21103799 is about 4593.8871340075. The cubic root of 21103799 is about 276.3462319746.

The spelling of 21103799 in words is "twenty-one million, one hundred three thousand, seven hundred ninety-nine".