21219883 has 2 divisors, whose sum is σ = 21219884. Its totient is φ = 21219882.

The previous prime is 21219871. The next prime is 21219901. The reversal of 21219883 is 38891212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21219883 - 2²¹ = 19122731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21219853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10609941 + 10609942.

It is an arithmetic number, because the mean of its divisors is an integer number (10609942).

Almost surely, 2^21219883 is an apocalyptic number.

21219883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21219883 is an equidigital number, since it uses as much as digits as its factorization.

21219883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 34.

The square root of 21219883 is about 4606.5044230957. The cubic root of 21219883 is about 276.8519977256.

The spelling of 21219883 in words is "twenty-one million, two hundred nineteen thousand, eight hundred eighty-three".