21929282 has 4 divisors (see below), whose sum is σ = 32893926. Its totient is φ = 10964640.

The previous prime is 21929267. The next prime is 21929293. The reversal of 21929282 is 28292912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12313081 + 9616201 = 3509^2 + 3101^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5482319 + ... + 5482322.

Almost surely, 2^21929282 is an apocalyptic number.

21929282 is a deficient number, since it is larger than the sum of its proper divisors (10964644).

21929282 is a wasteful number, since it uses less digits than its factorization.

21929282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10964643.

The product of its digits is 10368, while the sum is 35.

The square root of 21929282 is about 4682.8711278445. The cubic root of 21929282 is about 279.9033765246.

The spelling of 21929282 in words is "twenty-one million, nine hundred twenty-nine thousand, two hundred eighty-two".