20111111012 has 24 divisors (see below), whose sum is σ = 35869303680. Its totient is φ = 9863995680.

The previous prime is 20111111003. The next prime is 20111111021. The reversal of 20111111012 is 21011111102.

It is an interprime number because it is at equal distance from previous prime (20111111003) and next prime (20111111021).

It is a super-2 number, since 2×20111111012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20111110984 and 20111111002.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 92939 + ... + 221042.

It is an arithmetic number, because the mean of its divisors is an integer number (1494554320).

Almost surely, 2^20111111012 is an apocalyptic number.

It is an amenable number.

20111111012 is a deficient number, since it is larger than the sum of its proper divisors (15758192668).

20111111012 is a wasteful number, since it uses less digits than its factorization.

20111111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314291 (or 314289 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20111111012 its reverse (21011111102), we get a palindrome (41122222114).

The spelling of 20111111012 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, twelve".