21929283 has 12 divisors (see below), whose sum is σ = 31843968. Its totient is φ = 14541840.

The previous prime is 21929267. The next prime is 21929293. The reversal of 21929283 is 38292912.

It is not a de Polignac number, because 21929283 - 2⁴ = 21929267 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21929233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4660 + ... + 8097.

It is an arithmetic number, because the mean of its divisors is an integer number (2653664).

Almost surely, 2^21929283 is an apocalyptic number.

21929283 is a deficient number, since it is larger than the sum of its proper divisors (9914685).

21929283 is a wasteful number, since it uses less digits than its factorization.

21929283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12954 (or 12951 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21929283 is about 4682.8712346166. The cubic root of 21929283 is about 279.9033807792.

The spelling of 21929283 in words is "twenty-one million, nine hundred twenty-nine thousand, two hundred eighty-three".