21110339 has 4 divisors (see below), whose sum is σ = 21210600. Its totient is φ = 21010080.

The previous prime is 21110263. The next prime is 21110363. The reversal of 21110339 is 93301112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110339 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21110339.

It is not an unprimeable number, because it can be changed into a prime (21110839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49814 + ... + 50235.

It is an arithmetic number, because the mean of its divisors is an integer number (5302650).

Almost surely, 2^21110339 is an apocalyptic number.

21110339 is a deficient number, since it is larger than the sum of its proper divisors (100261).

21110339 is a wasteful number, since it uses less digits than its factorization.

21110339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100260.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21110339 is about 4594.5988943541. The cubic root of 21110339 is about 276.3747752982.

It can be divided in two parts, 211 and 10339, that multiplied together give a square (2181529 = 1477²).

The spelling of 21110339 in words is "twenty-one million, one hundred ten thousand, three hundred thirty-nine".