21103092 has 42 divisors (see below), whose sum is σ = 55377938. Its totient is φ = 7033392.

The previous prime is 21103087. The next prime is 21103109. The reversal of 21103092 is 29030112.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19131876 + 1971216 = 4374^2 + 1404^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 703 + ... + 6534.

Almost surely, 2^21103092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27688969).

21103092 is an abundant number, since it is smaller than the sum of its proper divisors (34274846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21103092 is an equidigital number, since it uses as much as digits as its factorization.

21103092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7259 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21103092 is about 4593.8101832792. The cubic root of 21103092 is about 276.3431459746.

The spelling of 21103092 in words is "twenty-one million, one hundred three thousand, ninety-two".