20321129999 has 8 divisors (see below), whose sum is σ = 20400576768. Its totient is φ = 20241837720.

The previous prime is 20321129981. The next prime is 20321130001. The reversal of 20321129999 is 99992112302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20321129999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321129599) 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, 228554 + ... + 304760.

It is an arithmetic number, because the mean of its divisors is an integer number (2550072096).

Almost surely, 2^20321129999 is an apocalyptic number.

20321129999 is a deficient number, since it is larger than the sum of its proper divisors (79446769).

20321129999 is an equidigital number, since it uses as much as digits as its factorization.

20321129999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77245.

The product of its (nonzero) digits is 157464, while the sum is 47.

The spelling of 20321129999 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-nine thousand, nine hundred ninety-nine".