21321341 has 2 divisors, whose sum is σ = 21321342. Its totient is φ = 21321340.

The previous prime is 21321337. The next prime is 21321359. The reversal of 21321341 is 14312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16168441 + 5152900 = 4021^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321341 - 2² = 21321337 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660670 + 10660671.

It is an arithmetic number, because the mean of its divisors is an integer number (10660671).

Almost surely, 2^21321341 is an apocalyptic number.

It is an amenable number.

21321341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321341 is an equidigital number, since it uses as much as digits as its factorization.

21321341 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 21321341 is about 4617.5037628572. The cubic root of 21321341 is about 277.2925311273.

Adding to 21321341 its reverse (14312312), we get a palindrome (35633653).

The spelling of 21321341 in words is "twenty-one million, three hundred twenty-one thousand, three hundred forty-one".