21112903 has 8 divisors (see below), whose sum is σ = 24781472. Its totient is φ = 17607456.

The previous prime is 21112879. The next prime is 21112907. The reversal of 21112903 is 30921112.

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 21112903 - 2¹³ = 21104711 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 (21112907) 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, 40500 + ... + 41017.

It is an arithmetic number, because the mean of its divisors is an integer number (3097684).

Almost surely, 2^21112903 is an apocalyptic number.

21112903 is a deficient number, since it is larger than the sum of its proper divisors (3668569).

21112903 is an equidigital number, since it uses as much as digits as its factorization.

21112903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81561.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 21112903 is about 4594.8779091506. The cubic root of 21112903 is about 276.3859640691.

The spelling of 21112903 in words is "twenty-one million, one hundred twelve thousand, nine hundred three".