21867067 has 2 divisors, whose sum is σ = 21867068. Its totient is φ = 21867066.

The previous prime is 21867047. The next prime is 21867071. The reversal of 21867067 is 76076812.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21867067 is a prime.

It is not a weakly prime, because it can be changed into another prime (21867047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10933533 + 10933534.

It is an arithmetic number, because the mean of its divisors is an integer number (10933534).

Almost surely, 2^21867067 is an apocalyptic number.

21867067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21867067 is an equidigital number, since it uses as much as digits as its factorization.

21867067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 21867067 is about 4676.2235831919. The cubic root of 21867067 is about 279.6384235875.

The spelling of 21867067 in words is "twenty-one million, eight hundred sixty-seven thousand, sixty-seven".