21944771 has 8 divisors (see below), whose sum is σ = 22184400. Its totient is φ = 21706848.

The previous prime is 21944759. The next prime is 21944777. The reversal of 21944771 is 17744912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21944771 - 2¹⁸ = 21682627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21944777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62705 + ... + 63053.

It is an arithmetic number, because the mean of its divisors is an integer number (2773050).

Almost surely, 2^21944771 is an apocalyptic number.

21944771 is a deficient number, since it is larger than the sum of its proper divisors (239629).

21944771 is a wasteful number, since it uses less digits than its factorization.

21944771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853.

The product of its digits is 14112, while the sum is 35.

The square root of 21944771 is about 4684.5246290312. The cubic root of 21944771 is about 279.9692610813.

The spelling of 21944771 in words is "twenty-one million, nine hundred forty-four thousand, seven hundred seventy-one".