21102344 has 16 divisors (see below), whose sum is σ = 39740220. Its totient is φ = 10504960.

The previous prime is 21102313. The next prime is 21102377. The reversal of 21102344 is 44320112.

It can be written as a sum of positive squares in 2 ways, for example, as 17724100 + 3378244 = 4210^2 + 1838^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3797 + ... + 7524.

Almost surely, 2^21102344 is an apocalyptic number.

It is an amenable number.

21102344 is a deficient number, since it is larger than the sum of its proper divisors (18637876).

21102344 is a wasteful number, since it uses less digits than its factorization.

21102344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11560 (or 11556 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21102344 is about 4593.7287686584. The cubic root of 21102344 is about 276.3398809378.

Adding to 21102344 its reverse (44320112), we get a palindrome (65422456).

The spelling of 21102344 in words is "twenty-one million, one hundred two thousand, three hundred forty-four".