21241889 has 2 divisors, whose sum is σ = 21241890. Its totient is φ = 21241888.

The previous prime is 21241877. The next prime is 21241901. The reversal of 21241889 is 98814212.

It is a balanced prime because it is at equal distance from previous prime (21241877) and next prime (21241901).

It can be written as a sum of positive squares in only one way, i.e., 20857489 + 384400 = 4567^2 + 620^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241889 - 2⁴ = 21241873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21241819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620944 + 10620945.

It is an arithmetic number, because the mean of its divisors is an integer number (10620945).

Almost surely, 2^21241889 is an apocalyptic number.

It is an amenable number.

21241889 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241889 is an equidigital number, since it uses as much as digits as its factorization.

21241889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 21241889 is about 4608.8923832088. The cubic root of 21241889 is about 276.9476674368.

The spelling of 21241889 in words is "twenty-one million, two hundred forty-one thousand, eight hundred eighty-nine".