20833434721 has 8 divisors (see below), whose sum is σ = 22733699904. Its totient is φ = 18934222320.

The previous prime is 20833434719. The next prime is 20833434733. The reversal of 20833434721 is 12743433802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20833434721 - 2¹ = 20833434719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20833434421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221526 + ... + 301231.

It is an arithmetic number, because the mean of its divisors is an integer number (2841712488).

Almost surely, 2^20833434721 is an apocalyptic number.

It is an amenable number.

20833434721 is a deficient number, since it is larger than the sum of its proper divisors (1900265183).

20833434721 is a wasteful number, since it uses less digits than its factorization.

20833434721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526391.

The product of its (nonzero) digits is 96768, while the sum is 37.

It can be divided in two parts, 20833 and 434721, that added together give a palindrome (455554).

The spelling of 20833434721 in words is "twenty billion, eight hundred thirty-three million, four hundred thirty-four thousand, seven hundred twenty-one".