21901103 has 4 divisors (see below), whose sum is σ = 25029840. Its totient is φ = 18772368.

The previous prime is 21901079. The next prime is 21901109. The reversal of 21901103 is 30110912.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21901103 - 2²⁴ = 5123887 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 (21901109) 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, 1564358 + ... + 1564371.

It is an arithmetic number, because the mean of its divisors is an integer number (6257460).

Almost surely, 2^21901103 is an apocalyptic number.

21901103 is a deficient number, since it is larger than the sum of its proper divisors (3128737).

21901103 is an equidigital number, since it uses as much as digits as its factorization.

21901103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128736.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 21901103 is about 4679.8614295725. The cubic root of 21901103 is about 279.7834337303.

The spelling of 21901103 in words is "twenty-one million, nine hundred one thousand, one hundred three".