21675283 has 8 divisors (see below), whose sum is σ = 24803168. Its totient is φ = 18555264.

The previous prime is 21675281. The next prime is 21675287. The reversal of 21675283 is 38257612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21675283 - 2¹ = 21675281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21675281) 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 7 ways as a sum of consecutive naturals, for example, 6235 + ... + 9067.

It is an arithmetic number, because the mean of its divisors is an integer number (3100396).

Almost surely, 2^21675283 is an apocalyptic number.

21675283 is a deficient number, since it is larger than the sum of its proper divisors (3127885).

21675283 is a wasteful number, since it uses less digits than its factorization.

21675283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933.

The product of its digits is 20160, while the sum is 34.

The square root of 21675283 is about 4655.6721319268. The cubic root of 21675283 is about 278.8185036782.

The spelling of 21675283 in words is "twenty-one million, six hundred seventy-five thousand, two hundred eighty-three".