21293283 has 16 divisors (see below), whose sum is σ = 31099392. Its totient is φ = 12852000.

The previous prime is 21293273. The next prime is 21293317. The reversal of 21293283 is 38239212.

It is a happy number.

It is not a de Polignac number, because 21293283 - 2⁹ = 21292771 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21293283.

It is not an unprimeable number, because it can be changed into a prime (21293263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7753 + ... + 10133.

It is an arithmetic number, because the mean of its divisors is an integer number (1943712).

Almost surely, 2^21293283 is an apocalyptic number.

21293283 is a deficient number, since it is larger than the sum of its proper divisors (9806109).

21293283 is a wasteful number, since it uses less digits than its factorization.

21293283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666.

The product of its digits is 5184, while the sum is 30.

The square root of 21293283 is about 4614.4645409841. The cubic root of 21293283 is about 277.1708425778.

The spelling of 21293283 in words is "twenty-one million, two hundred ninety-three thousand, two hundred eighty-three".