21323914 has 16 divisors (see below), whose sum is σ = 33476328. Its totient is φ = 10176192.

The previous prime is 21323893. The next prime is 21323941. The reversal of 21323914 is 41932312.

It can be written as a sum of positive squares in 4 ways, for example, as 21316689 + 7225 = 4617^2 + 85^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1204 + ... + 6640.

Almost surely, 2^21323914 is an apocalyptic number.

21323914 is a deficient number, since it is larger than the sum of its proper divisors (12152414).

21323914 is a wasteful number, since it uses less digits than its factorization.

21323914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5529.

The product of its digits is 1296, while the sum is 25.

The square root of 21323914 is about 4617.7823681936. The cubic root of 21323914 is about 277.3036849752.

It can be divided in two parts, 213239 and 14, that multiplied together give a triangular number (2985346 = T₂₄₄₃).

The spelling of 21323914 in words is "twenty-one million, three hundred twenty-three thousand, nine hundred fourteen".