20012120011 has 8 divisors (see below), whose sum is σ = 21566938400. Its totient is φ = 18459505152.

The previous prime is 20012120003. The next prime is 20012120021. The reversal of 20012120011 is 11002121002.

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

It is a cyclic number.

It is not a de Polignac number, because 20012120011 - 2³ = 20012120003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012120011.

It is not an unprimeable number, because it can be changed into a prime (20012120021) 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, 531990 + ... + 568363.

It is an arithmetic number, because the mean of its divisors is an integer number (2695867300).

Almost surely, 2^20012120011 is an apocalyptic number.

20012120011 is a deficient number, since it is larger than the sum of its proper divisors (1554818389).

20012120011 is a wasteful number, since it uses less digits than its factorization.

20012120011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101765.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20012120011 its reverse (11002121002), we get a palindrome (31014241013).

Subtracting from 20012120011 its reverse (11002121002), we obtain a palindrome (9009999009).

The spelling of 20012120011 in words is "twenty billion, twelve million, one hundred twenty thousand, eleven".