21940443 has 32 divisors (see below), whose sum is σ = 38438400. Its totient is φ = 12102048.

The previous prime is 21940441. The next prime is 21940483. The reversal of 21940443 is 34404912.

21940443 is a `hidden beast` number, since 219 + 4 + 0 + 443 = 666.

It is not a de Polignac number, because 21940443 - 2¹ = 21940441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21940441) 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, 3480 + ... + 7482.

It is an arithmetic number, because the mean of its divisors is an integer number (1201200).

Almost surely, 2^21940443 is an apocalyptic number.

21940443 is a deficient number, since it is larger than the sum of its proper divisors (16497957).

21940443 is a wasteful number, since it uses less digits than its factorization.

21940443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048 (or 4042 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21940443 is about 4684.0626597004. The cubic root of 21940443 is about 279.9508544697.

The spelling of 21940443 in words is "twenty-one million, nine hundred forty thousand, four hundred forty-three".