21676619 has 2 divisors, whose sum is σ = 21676620. Its totient is φ = 21676618.

The previous prime is 21676607. The next prime is 21676631. The reversal of 21676619 is 91667612.

It is a balanced prime because it is at equal distance from previous prime (21676607) and next prime (21676631).

It is a cyclic number.

It is not a de Polignac number, because 21676619 - 2²⁴ = 4899403 is a prime.

It is a super-2 number, since 2×21676619² = 939751622542322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21676639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838309 + 10838310.

It is an arithmetic number, because the mean of its divisors is an integer number (10838310).

Almost surely, 2^21676619 is an apocalyptic number.

21676619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676619 is an equidigital number, since it uses as much as digits as its factorization.

21676619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 21676619 is about 4655.8156106100. The cubic root of 21676619 is about 278.8242320750.

The spelling of 21676619 in words is "twenty-one million, six hundred seventy-six thousand, six hundred nineteen".