21241901 has 2 divisors, whose sum is σ = 21241902. Its totient is φ = 21241900.

The previous prime is 21241889. The next prime is 21241921. The reversal of 21241901 is 10914212.

It is an a-pointer prime, because the next prime (21241921) can be obtained adding 21241901 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13147876 + 8094025 = 3626^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241901 - 2⁶ = 21241837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620950 + 10620951.

It is an arithmetic number, because the mean of its divisors is an integer number (10620951).

Almost surely, 2^21241901 is an apocalyptic number.

It is an amenable number.

21241901 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241901 is an equidigital number, since it uses as much as digits as its factorization.

21241901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 21241901 is about 4608.8936850398. The cubic root of 21241901 is about 276.9477195881.

The spelling of 21241901 in words is "twenty-one million, two hundred forty-one thousand, nine hundred one".