21940241 has 2 divisors, whose sum is σ = 21940242. Its totient is φ = 21940240.

The previous prime is 21940201. The next prime is 21940267. The reversal of 21940241 is 14204912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12453841 + 9486400 = 3529^2 + 3080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21940241 is a prime.

It is not a weakly prime, because it can be changed into another prime (21940201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10970120 + 10970121.

It is an arithmetic number, because the mean of its divisors is an integer number (10970121).

Almost surely, 2^21940241 is an apocalyptic number.

It is an amenable number.

21940241 is a deficient number, since it is larger than the sum of its proper divisors (1).

21940241 is an equidigital number, since it uses as much as digits as its factorization.

21940241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 21940241 is about 4684.0410971724. The cubic root of 21940241 is about 279.9499953220.

The spelling of 21940241 in words is "twenty-one million, nine hundred forty thousand, two hundred forty-one".