21662232345 has 48 divisors (see below), whose sum is σ = 41199172560. Its totient is φ = 10463251968.

The previous prime is 21662232331. The next prime is 21662232391. The reversal of 21662232345 is 54323226612.

21662232345 is a `hidden beast` number, since 2 + 1 + 6 + 622 + 3 + 23 + 4 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 816359184 + 20845873161 = 28572^2 + 144381^2 .

It is not a de Polignac number, because 21662232345 - 2⁶ = 21662232281 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 318330 + ... + 380339.

It is an arithmetic number, because the mean of its divisors is an integer number (858316095).

Almost surely, 2^21662232345 is an apocalyptic number.

It is an amenable number.

21662232345 is a deficient number, since it is larger than the sum of its proper divisors (19536940215).

21662232345 is a wasteful number, since it uses less digits than its factorization.

21662232345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698746 (or 698743 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

Adding to 21662232345 its reverse (54323226612), we get a palindrome (75985458957).

The spelling of 21662232345 in words is "twenty-one billion, six hundred sixty-two million, two hundred thirty-two thousand, three hundred forty-five".