21044323345 has 4 divisors (see below), whose sum is σ = 25253188020. Its totient is φ = 16835458672.

The previous prime is 21044323283. The next prime is 21044323351. The reversal of 21044323345 is 54332344012.

It is a happy number.

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 3898254096 + 17146069249 = 62436^2 + 130943^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044323345 - 2¹⁵ = 21044290577 is a prime.

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, 2104432330 + ... + 2104432339.

It is an arithmetic number, because the mean of its divisors is an integer number (6313297005).

Almost surely, 2^21044323345 is an apocalyptic number.

It is an amenable number.

21044323345 is a deficient number, since it is larger than the sum of its proper divisors (4208864675).

21044323345 is an equidigital number, since it uses as much as digits as its factorization.

21044323345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208864674.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21044323345 its reverse (54332344012), we get a palindrome (75376667357).

The spelling of 21044323345 in words is "twenty-one billion, forty-four million, three hundred twenty-three thousand, three hundred forty-five".