21922441 has 4 divisors (see below), whose sum is σ = 21952384. Its totient is φ = 21892500.

The previous prime is 21922429. The next prime is 21922501. The reversal of 21922441 is 14422912.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21922441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21926441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13845 + ... + 15346.

It is an arithmetic number, because the mean of its divisors is an integer number (5488096).

Almost surely, 2^21922441 is an apocalyptic number.

It is an amenable number.

21922441 is a deficient number, since it is larger than the sum of its proper divisors (29943).

21922441 is an equidigital number, since it uses as much as digits as its factorization.

21922441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29942.

The product of its digits is 1152, while the sum is 25.

The square root of 21922441 is about 4682.1406429111. The cubic root of 21922441 is about 279.8742675286.

The spelling of 21922441 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred forty-one".