21128883 has 4 divisors (see below), whose sum is σ = 28171848. Its totient is φ = 14085920.

The previous prime is 21128873. The next prime is 21128917. The reversal of 21128883 is 38882112.

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 21128883 - 2⁵ = 21128851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21128843) 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, 3521478 + ... + 3521483.

It is an arithmetic number, because the mean of its divisors is an integer number (7042962).

Almost surely, 2^21128883 is an apocalyptic number.

21128883 is a deficient number, since it is larger than the sum of its proper divisors (7042965).

21128883 is an equidigital number, since it uses as much as digits as its factorization.

21128883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7042964.

The product of its digits is 6144, while the sum is 33.

The square root of 21128883 is about 4596.6164730158. The cubic root of 21128883 is about 276.4556771079.

The spelling of 21128883 in words is "twenty-one million, one hundred twenty-eight thousand, eight hundred eighty-three".