20112120999 has 12 divisors (see below), whose sum is σ = 29188525912. Its totient is φ = 13344534000.

The previous prime is 20112120983. The next prime is 20112121019. The reversal of 20112120999 is 99902121102.

It is not a de Polignac number, because 20112120999 - 2⁴ = 20112120983 is a prime.

It is a super-2 number, since 2×20112120999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112120979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5293552 + ... + 5297349.

Almost surely, 2^20112120999 is an apocalyptic number.

20112120999 is a deficient number, since it is larger than the sum of its proper divisors (9076404913).

20112120999 is a wasteful number, since it uses less digits than its factorization.

20112120999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10591118 (or 10591115 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 20112120999 in words is "twenty billion, one hundred twelve million, one hundred twenty thousand, nine hundred ninety-nine".