20121331199 has 4 divisors (see below), whose sum is σ = 20254585200. Its totient is φ = 19988077200.

The previous prime is 20121331187. The next prime is 20121331207. The reversal of 20121331199 is 99113312102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20121331199 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 (20121331099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66626774 + ... + 66627075.

It is an arithmetic number, because the mean of its divisors is an integer number (5063646300).

Almost surely, 2^20121331199 is an apocalyptic number.

20121331199 is a deficient number, since it is larger than the sum of its proper divisors (133254001).

20121331199 is a wasteful number, since it uses less digits than its factorization.

20121331199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133254000.

The product of its (nonzero) digits is 2916, while the sum is 32.

The spelling of 20121331199 in words is "twenty billion, one hundred twenty-one million, three hundred thirty-one thousand, one hundred ninety-nine".