20123219999 has 8 divisors (see below), whose sum is σ = 21214322688. Its totient is φ = 19059740280.

The previous prime is 20123219993. The next prime is 20123220001. The reversal of 20123219999 is 99991232102.

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-20123219999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123219993) 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 7 ways as a sum of consecutive naturals, for example, 6904247 + ... + 6907160.

It is an arithmetic number, because the mean of its divisors is an integer number (2651790336).

Almost surely, 2^20123219999 is an apocalyptic number.

20123219999 is a deficient number, since it is larger than the sum of its proper divisors (1091102689).

20123219999 is a wasteful number, since it uses less digits than its factorization.

20123219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13811485.

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

The spelling of 20123219999 in words is "twenty billion, one hundred twenty-three million, two hundred nineteen thousand, nine hundred ninety-nine".