21002341 has 2 divisors, whose sum is σ = 21002342. Its totient is φ = 21002340.

The previous prime is 21002329. The next prime is 21002357. The reversal of 21002341 is 14320012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20061441 + 940900 = 4479^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 21002341 - 2⁷ = 21002213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21002941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501170 + 10501171.

It is an arithmetic number, because the mean of its divisors is an integer number (10501171).

Almost surely, 2^21002341 is an apocalyptic number.

It is an amenable number.

21002341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002341 is an equidigital number, since it uses as much as digits as its factorization.

21002341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21002341 is about 4582.8311118783. The cubic root of 21002341 is about 275.9026690691.

Adding to 21002341 its reverse (14320012), we get a palindrome (35322353).

The spelling of 21002341 in words is "twenty-one million, two thousand, three hundred forty-one".