21303572345 has 16 divisors (see below), whose sum is σ = 28536881472. Its totient is φ = 15133191360.

The previous prime is 21303572333. The next prime is 21303572383. The reversal of 21303572345 is 54327530312.

It is not a de Polignac number, because 21303572345 - 2¹⁸ = 21303310201 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4501562 + ... + 4506291.

It is an arithmetic number, because the mean of its divisors is an integer number (1783555092).

Almost surely, 2^21303572345 is an apocalyptic number.

It is an amenable number.

21303572345 is a deficient number, since it is larger than the sum of its proper divisors (7233309127).

21303572345 is a wasteful number, since it uses less digits than its factorization.

21303572345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9007912.

The product of its (nonzero) digits is 75600, while the sum is 35.

The spelling of 21303572345 in words is "twenty-one billion, three hundred three million, five hundred seventy-two thousand, three hundred forty-five".