21924941 has 2 divisors, whose sum is σ = 21924942. Its totient is φ = 21924940.

The previous prime is 21924937. The next prime is 21924943. The reversal of 21924941 is 14942912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21659716 + 265225 = 4654^2 + 515^2 .

It is a cyclic number.

It is not a de Polignac number, because 21924941 - 2² = 21924937 is a prime.

Together with 21924943, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21924898 and 21924907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21924943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10962470 + 10962471.

It is an arithmetic number, because the mean of its divisors is an integer number (10962471).

Almost surely, 2^21924941 is an apocalyptic number.

It is an amenable number.

21924941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21924941 is an equidigital number, since it uses as much as digits as its factorization.

21924941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 21924941 is about 4682.4076072038. The cubic root of 21924941 is about 279.8849059283.

The spelling of 21924941 in words is "twenty-one million, nine hundred twenty-four thousand, nine hundred forty-one".