21926938 has 16 divisors (see below), whose sum is σ = 36470880. Its totient is φ = 9802800.

The previous prime is 21926917. The next prime is 21926939. The reversal of 21926938 is 83962912.

It is a happy number.

It is a super-2 number, since 2×21926938² = 961581220111688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21926938.

It is not an unprimeable number, because it can be changed into a prime (21926939) 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 in 7 ways as a sum of consecutive naturals, for example, 6828 + ... + 9511.

It is an arithmetic number, because the mean of its divisors is an integer number (2279430).

Almost surely, 2^21926938 is an apocalyptic number.

21926938 is a deficient number, since it is larger than the sum of its proper divisors (14543942).

21926938 is a wasteful number, since it uses less digits than its factorization.

21926938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16413.

The product of its digits is 46656, while the sum is 40.

The square root of 21926938 is about 4682.6208473461. The cubic root of 21926938 is about 279.8934033011.

The spelling of 21926938 in words is "twenty-one million, nine hundred twenty-six thousand, nine hundred thirty-eight".