20112110021 has 4 divisors (see below), whose sum is σ = 20256801600. Its totient is φ = 19967418444.

The previous prime is 20112109999. The next prime is 20112110023. The reversal of 20112110021 is 12001121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112109984 and 20112110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112110023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72345581 + ... + 72345858.

It is an arithmetic number, because the mean of its divisors is an integer number (5064200400).

Almost surely, 2^20112110021 is an apocalyptic number.

It is an amenable number.

20112110021 is a deficient number, since it is larger than the sum of its proper divisors (144691579).

20112110021 is a wasteful number, since it uses less digits than its factorization.

20112110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144691578.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20112110021 its reverse (12001121102), we get a palindrome (32113231123).

The spelling of 20112110021 in words is "twenty billion, one hundred twelve million, one hundred ten thousand, twenty-one".