21113941 has 2 divisors, whose sum is σ = 21113942. Its totient is φ = 21113940.

The previous prime is 21113933. The next prime is 21113957. The reversal of 21113941 is 14931112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 5193841 = 3990^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113941 - 2³ = 21113933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556970 + 10556971.

It is an arithmetic number, because the mean of its divisors is an integer number (10556971).

Almost surely, 2^21113941 is an apocalyptic number.

It is an amenable number.

21113941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113941 is an equidigital number, since it uses as much as digits as its factorization.

21113941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 22.

The square root of 21113941 is about 4594.9908596209. The cubic root of 21113941 is about 276.3904934309.

The spelling of 21113941 in words is "twenty-one million, one hundred thirteen thousand, nine hundred forty-one".