21682967 has 2 divisors, whose sum is σ = 21682968. Its totient is φ = 21682966.

The previous prime is 21682963. The next prime is 21682979. The reversal of 21682967 is 76928612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21682967 - 2² = 21682963 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21682963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10841483 + 10841484.

It is an arithmetic number, because the mean of its divisors is an integer number (10841484).

Almost surely, 2^21682967 is an apocalyptic number.

21682967 is a deficient number, since it is larger than the sum of its proper divisors (1).

21682967 is an equidigital number, since it uses as much as digits as its factorization.

21682967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 21682967 is about 4656.4972887354. The cubic root of 21682967 is about 278.8514473197.

The spelling of 21682967 in words is "twenty-one million, six hundred eighty-two thousand, nine hundred sixty-seven".