21941411 has 2 divisors, whose sum is σ = 21941412. Its totient is φ = 21941410.

The previous prime is 21941401. The next prime is 21941431. The reversal of 21941411 is 11414912.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21941411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21941401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10970705 + 10970706.

It is an arithmetic number, because the mean of its divisors is an integer number (10970706).

Almost surely, 2^21941411 is an apocalyptic number.

21941411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21941411 is an equidigital number, since it uses as much as digits as its factorization.

21941411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 21941411 is about 4684.1659876653. The cubic root of 21941411 is about 279.9549715006.

The spelling of 21941411 in words is "twenty-one million, nine hundred forty-one thousand, four hundred eleven".