21890283 has 4 divisors (see below), whose sum is σ = 29187048. Its totient is φ = 14593520.

The previous prime is 21890257. The next prime is 21890317. The reversal of 21890283 is 38209812.

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

It is a cyclic number.

It is not a de Polignac number, because 21890283 - 2¹⁴ = 21873899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21890213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3648378 + ... + 3648383.

It is an arithmetic number, because the mean of its divisors is an integer number (7296762).

Almost surely, 2^21890283 is an apocalyptic number.

21890283 is a deficient number, since it is larger than the sum of its proper divisors (7296765).

21890283 is an equidigital number, since it uses as much as digits as its factorization.

21890283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7296764.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21890283 is about 4678.7052696232. The cubic root of 21890283 is about 279.7373514939.

The spelling of 21890283 in words is "twenty-one million, eight hundred ninety thousand, two hundred eighty-three".