21946411 has 2 divisors, whose sum is σ = 21946412. Its totient is φ = 21946410.

The previous prime is 21946409. The next prime is 21946423. The reversal of 21946411 is 11464912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21946411 - 2¹ = 21946409 is a prime.

Together with 21946409, it forms a pair of twin primes.

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 21946411.

It is not a weakly prime, because it can be changed into another prime (21941411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10973205 + 10973206.

It is an arithmetic number, because the mean of its divisors is an integer number (10973206).

Almost surely, 2^21946411 is an apocalyptic number.

21946411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21946411 is an equidigital number, since it uses as much as digits as its factorization.

21946411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 21946411 is about 4684.6996702030. The cubic root of 21946411 is about 279.9762352279.

The spelling of 21946411 in words is "twenty-one million, nine hundred forty-six thousand, four hundred eleven".