21232345215 has 32 divisors (see below), whose sum is σ = 35396121600. Its totient is φ = 10854748800.

The previous prime is 21232345151. The next prime is 21232345217. The reversal of 21232345215 is 51254323212.

It is not a de Polignac number, because 21232345215 - 2⁶ = 21232345151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232345217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115111 + ... + 236040.

It is an arithmetic number, because the mean of its divisors is an integer number (1106128800).

Almost surely, 2^21232345215 is an apocalyptic number.

21232345215 is a deficient number, since it is larger than the sum of its proper divisors (14163776385).

21232345215 is a wasteful number, since it uses less digits than its factorization.

21232345215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351327.

The product of its digits is 14400, while the sum is 30.

Adding to 21232345215 its reverse (51254323212), we get a palindrome (72486668427).

The spelling of 21232345215 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-five thousand, two hundred fifteen".