21911741 has 2 divisors, whose sum is σ = 21911742. Its totient is φ = 21911740.

The previous prime is 21911713. The next prime is 21911767. The reversal of 21911741 is 14711912.

It is an a-pointer prime, because the next prime (21911767) can be obtained adding 21911741 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11323225 + 10588516 = 3365^2 + 3254^2 .

It is a cyclic number.

It is not a de Polignac number, because 21911741 - 2¹⁰ = 21910717 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21911741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21911441) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10955870 + 10955871.

It is an arithmetic number, because the mean of its divisors is an integer number (10955871).

Almost surely, 2^21911741 is an apocalyptic number.

It is an amenable number.

21911741 is a deficient number, since it is larger than the sum of its proper divisors (1).

21911741 is an equidigital number, since it uses as much as digits as its factorization.

21911741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 26.

The square root of 21911741 is about 4680.9978637038. The cubic root of 21911741 is about 279.8287260366.

The spelling of 21911741 in words is "twenty-one million, nine hundred eleven thousand, seven hundred forty-one".