21341867 has 2 divisors, whose sum is σ = 21341868. Its totient is φ = 21341866.

The previous prime is 21341863. The next prime is 21341897. The reversal of 21341867 is 76814312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21341867 - 2² = 21341863 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21341863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10670933 + 10670934.

It is an arithmetic number, because the mean of its divisors is an integer number (10670934).

Almost surely, 2^21341867 is an apocalyptic number.

21341867 is a deficient number, since it is larger than the sum of its proper divisors (1).

21341867 is an equidigital number, since it uses as much as digits as its factorization.

21341867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 32.

The square root of 21341867 is about 4619.7258576673. The cubic root of 21341867 is about 277.3814855229.

The spelling of 21341867 in words is "twenty-one million, three hundred forty-one thousand, eight hundred sixty-seven".