21934867 has 4 divisors (see below), whose sum is σ = 21951000. Its totient is φ = 21918736.

The previous prime is 21934849. The next prime is 21934889. The reversal of 21934867 is 76843912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21934867 - 2¹¹ = 21932819 is a prime.

It is a super-2 number, since 2×21934867² = 962276780615378, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21934837) 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 in 3 ways as a sum of consecutive naturals, for example, 5818 + ... + 8815.

It is an arithmetic number, because the mean of its divisors is an integer number (5487750).

Almost surely, 2^21934867 is an apocalyptic number.

21934867 is a deficient number, since it is larger than the sum of its proper divisors (16133).

21934867 is a wasteful number, since it uses less digits than its factorization.

21934867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16132.

The product of its digits is 72576, while the sum is 40.

The square root of 21934867 is about 4683.4674120784. The cubic root of 21934867 is about 279.9271366529.

It can be divided in two parts, 21934 and 867, that added together give a square (22801 = 151²).

The spelling of 21934867 in words is "twenty-one million, nine hundred thirty-four thousand, eight hundred sixty-seven".