21343045 has 4 divisors (see below), whose sum is σ = 25611660. Its totient is φ = 17074432.

The previous prime is 21343039. The next prime is 21343111. The reversal of 21343045 is 54034312.

21343045 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14546596 + 6796449 = 3814^2 + 2607^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343045 - 2⁵ = 21343013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134300 + ... + 2134309.

It is an arithmetic number, because the mean of its divisors is an integer number (6402915).

Almost surely, 2^21343045 is an apocalyptic number.

It is an amenable number.

21343045 is a deficient number, since it is larger than the sum of its proper divisors (4268615).

21343045 is an equidigital number, since it uses as much as digits as its factorization.

21343045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268614.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 21343045 is about 4619.8533526509. The cubic root of 21343045 is about 277.3865889405.

Adding to 21343045 its reverse (54034312), we get a palindrome (75377357).

The spelling of 21343045 in words is "twenty-one million, three hundred forty-three thousand, forty-five".