20112111021 has 16 divisors (see below), whose sum is σ = 28390703040. Its totient is φ = 12628955520.

The previous prime is 20112110989. The next prime is 20112111109. The reversal of 20112111021 is 12011121102.

It is not a de Polignac number, because 20112111021 - 2⁵ = 20112110989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112110988 and 20112111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112111221) 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, 1009920 + ... + 1029641.

It is an arithmetic number, because the mean of its divisors is an integer number (1774418940).

Almost surely, 2^20112111021 is an apocalyptic number.

It is an amenable number.

20112111021 is a deficient number, since it is larger than the sum of its proper divisors (8278592019).

20112111021 is a wasteful number, since it uses less digits than its factorization.

20112111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039756.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20112111021 its reverse (12011121102), we get a palindrome (32123232123).

The spelling of 20112111021 in words is "twenty billion, one hundred twelve million, one hundred eleven thousand, twenty-one".