21943492 has 6 divisors (see below), whose sum is σ = 38401118. Its totient is φ = 10971744.

The previous prime is 21943483. The next prime is 21943507. The reversal of 21943492 is 29434912.

It can be written as a sum of positive squares in only one way, i.e., 11600836 + 10342656 = 3406^2 + 3216^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2742933 + ... + 2742940.

Almost surely, 2^21943492 is an apocalyptic number.

It is an amenable number.

21943492 is a deficient number, since it is larger than the sum of its proper divisors (16457626).

21943492 is a wasteful number, since it uses less digits than its factorization.

21943492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485877 (or 5485875 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21943492 is about 4684.3881137241. The cubic root of 21943492 is about 279.9638218563.

The spelling of 21943492 in words is "twenty-one million, nine hundred forty-three thousand, four hundred ninety-two".