21944967 has 32 divisors (see below), whose sum is σ = 34490880. Its totient is φ = 12270720.

The previous prime is 21944941. The next prime is 21944987. The reversal of 21944967 is 76944912.

It is not a de Polignac number, because 21944967 - 2¹¹ = 21942919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21513 + ... + 22509.

It is an arithmetic number, because the mean of its divisors is an integer number (1077840).

Almost surely, 2^21944967 is an apocalyptic number.

21944967 is a deficient number, since it is larger than the sum of its proper divisors (12545913).

21944967 is a wasteful number, since it uses less digits than its factorization.

21944967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063.

The product of its digits is 108864, while the sum is 42.

The square root of 21944967 is about 4684.5455489300. The cubic root of 21944967 is about 279.9700945952.

Subtracting 21944967 from its reverse (76944912), we obtain a palindrome (54999945).

The spelling of 21944967 in words is "twenty-one million, nine hundred forty-four thousand, nine hundred sixty-seven".