21232344145 has 4 divisors (see below), whose sum is σ = 25478812980. Its totient is φ = 16985875312.

The previous prime is 21232344127. The next prime is 21232344169. The reversal of 21232344145 is 54144323212.

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 4177812496 + 17054531649 = 64636^2 + 130593^2 .

It is a cyclic number.

It is not a de Polignac number, because 21232344145 - 2⁷ = 21232344017 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, 2123234410 + ... + 2123234419.

It is an arithmetic number, because the mean of its divisors is an integer number (6369703245).

Almost surely, 2^21232344145 is an apocalyptic number.

It is an amenable number.

21232344145 is a deficient number, since it is larger than the sum of its proper divisors (4246468835).

21232344145 is an equidigital number, since it uses as much as digits as its factorization.

21232344145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246468834.

The product of its digits is 23040, while the sum is 31.

Adding to 21232344145 its reverse (54144323212), we get a palindrome (75376667357).

The spelling of 21232344145 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-four thousand, one hundred forty-five".