21033252345 has 16 divisors (see below), whose sum is σ = 38460804480. Its totient is φ = 9615201024.

The previous prime is 21033252319. The next prime is 21033252347. The reversal of 21033252345 is 54325233012.

It is not a de Polignac number, because 21033252345 - 2²⁶ = 20966143481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21033252347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100158240 + ... + 100158449.

It is an arithmetic number, because the mean of its divisors is an integer number (2403800280).

Almost surely, 2^21033252345 is an apocalyptic number.

It is an amenable number.

21033252345 is a deficient number, since it is larger than the sum of its proper divisors (17427552135).

21033252345 is a wasteful number, since it uses less digits than its factorization.

21033252345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200316704.

The product of its (nonzero) digits is 21600, while the sum is 30.

Adding to 21033252345 its reverse (54325233012), we get a palindrome (75358485357).

The spelling of 21033252345 in words is "twenty-one billion, thirty-three million, two hundred fifty-two thousand, three hundred forty-five".