21343151 has 2 divisors, whose sum is σ = 21343152. Its totient is φ = 21343150.

The previous prime is 21343141. The next prime is 21343163. The reversal of 21343151 is 15134312.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21343151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671575 + 10671576.

It is an arithmetic number, because the mean of its divisors is an integer number (10671576).

Almost surely, 2^21343151 is an apocalyptic number.

21343151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343151 is an equidigital number, since it uses as much as digits as its factorization.

21343151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 21343151 is about 4619.8648248623. The cubic root of 21343151 is about 277.3870481522.

Adding to 21343151 its reverse (15134312), we get a palindrome (36477463).

The spelling of 21343151 in words is "twenty-one million, three hundred forty-three thousand, one hundred fifty-one".