21616883 has 2 divisors, whose sum is σ = 21616884. Its totient is φ = 21616882.

The previous prime is 21616853. The next prime is 21616891. The reversal of 21616883 is 38861612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21616883 - 2²² = 17422579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21616823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10808441 + 10808442.

It is an arithmetic number, because the mean of its divisors is an integer number (10808442).

Almost surely, 2^21616883 is an apocalyptic number.

21616883 is a deficient number, since it is larger than the sum of its proper divisors (1).

21616883 is an equidigital number, since it uses as much as digits as its factorization.

21616883 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 21616883 is about 4649.3959822755. The cubic root of 21616883 is about 278.5678703281.

The spelling of 21616883 in words is "twenty-one million, six hundred sixteen thousand, eight hundred eighty-three".