20111012233 has 16 divisors (see below), whose sum is σ = 22285213776. Its totient is φ = 18033350400.

The previous prime is 20111012221. The next prime is 20111012239. The reversal of 20111012233 is 33221011102.

It can be written as a sum of positive squares in 8 ways, for example, as 3004464969 + 17106547264 = 54813^2 + 130792^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20111012233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20111012239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74910 + ... + 214087.

It is an arithmetic number, because the mean of its divisors is an integer number (1392825861).

Almost surely, 2^20111012233 is an apocalyptic number.

It is an amenable number.

20111012233 is a deficient number, since it is larger than the sum of its proper divisors (2174201543).

20111012233 is a wasteful number, since it uses less digits than its factorization.

20111012233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289164.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20111012233 its reverse (33221011102), we get a palindrome (53332023335).

The spelling of 20111012233 in words is "twenty billion, one hundred eleven million, twelve thousand, two hundred thirty-three".