21233052645 has 24 divisors (see below), whose sum is σ = 39519478944. Its totient is φ = 9706538016.

The previous prime is 21233052563. The next prime is 21233052671. The reversal of 21233052645 is 54625033212.

It is a happy number.

It is not a de Polignac number, because 21233052645 - 2⁹ = 21233052133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14443519 + ... + 14444988.

It is an arithmetic number, because the mean of its divisors is an integer number (1646644956).

Almost surely, 2^21233052645 is an apocalyptic number.

It is an amenable number.

21233052645 is a deficient number, since it is larger than the sum of its proper divisors (18286426299).

21233052645 is a wasteful number, since it uses less digits than its factorization.

21233052645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28888529 (or 28888522 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 21233052645 its reverse (54625033212), we get a palindrome (75858085857).

The spelling of 21233052645 in words is "twenty-one billion, two hundred thirty-three million, fifty-two thousand, six hundred forty-five".