20312209999 has 2 divisors, whose sum is σ = 20312210000. Its totient is φ = 20312209998.

The previous prime is 20312209987. The next prime is 20312210063. The reversal of 20312209999 is 99990221302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20312209999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312209919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156104999 + 10156105000.

It is an arithmetic number, because the mean of its divisors is an integer number (10156105000).

Almost surely, 2^20312209999 is an apocalyptic number.

20312209999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312209999 is an equidigital number, since it uses as much as digits as its factorization.

20312209999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The spelling of 20312209999 in words is "twenty billion, three hundred twelve million, two hundred nine thousand, nine hundred ninety-nine".