21207341 has 2 divisors, whose sum is σ = 21207342. Its totient is φ = 21207340.

The previous prime is 21207331. The next prime is 21207377. The reversal of 21207341 is 14370212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 240100 = 4579^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 21207341 - 2¹⁴ = 21190957 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 (21207301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10603670 + 10603671.

It is an arithmetic number, because the mean of its divisors is an integer number (10603671).

Almost surely, 2^21207341 is an apocalyptic number.

It is an amenable number.

21207341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21207341 is an equidigital number, since it uses as much as digits as its factorization.

21207341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21207341 is about 4605.1428859483. The cubic root of 21207341 is about 276.7974425697.

Adding to 21207341 its reverse (14370212), we get a palindrome (35577553).

The spelling of 21207341 in words is "twenty-one million, two hundred seven thousand, three hundred forty-one".