21199324 has 12 divisors (see below), whose sum is σ = 37254448. Its totient is φ = 10555200.

The previous prime is 21199259. The next prime is 21199327. The reversal of 21199324 is 42399112.

It is a super-2 number, since 2×21199324² = 898822676113952, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21199327) 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, 10032 + ... + 11959.

Almost surely, 2^21199324 is an apocalyptic number.

It is an amenable number.

21199324 is a deficient number, since it is larger than the sum of its proper divisors (16055124).

21199324 is a wasteful number, since it uses less digits than its factorization.

21199324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22236 (or 22234 counting only the distinct ones).

The product of its digits is 3888, while the sum is 31.

The square root of 21199324 is about 4604.2723637943. The cubic root of 21199324 is about 276.7625589763.

It can be divided in two parts, 2119932 and 4, that added together give a square (2119936 = 1456²).

The spelling of 21199324 in words is "twenty-one million, one hundred ninety-nine thousand, three hundred twenty-four".