21213341 has 2 divisors, whose sum is σ = 21213342. Its totient is φ = 21213340.

The previous prime is 21213293. The next prime is 21213343. The reversal of 21213341 is 14331212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18887716 + 2325625 = 4346^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213341 - 2¹⁸ = 20951197 is a prime.

Together with 21213343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606670 + 10606671.

It is an arithmetic number, because the mean of its divisors is an integer number (10606671).

Almost surely, 2^21213341 is an apocalyptic number.

It is an amenable number.

21213341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213341 is an equidigital number, since it uses as much as digits as its factorization.

21213341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144, while the sum is 17.

The square root of 21213341 is about 4605.7942854626. The cubic root of 21213341 is about 276.8235440355.

Adding to 21213341 its reverse (14331212), we get a palindrome (35544553).

The spelling of 21213341 in words is "twenty-one million, two hundred thirteen thousand, three hundred forty-one".