20112120021 has 24 divisors (see below), whose sum is σ = 31210903584. Its totient is φ = 11486526240.

The previous prime is 20112120013. The next prime is 20112120071. The reversal of 20112120021 is 12002121102.

It is not a de Polignac number, because 20112120021 - 2³ = 20112120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20112119979 and 20112120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112120071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248431 + ... + 319283.

It is an arithmetic number, because the mean of its divisors is an integer number (1300454316).

Almost surely, 2^20112120021 is an apocalyptic number.

20112120021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20112120021 is a deficient number, since it is larger than the sum of its proper divisors (11098783563).

20112120021 is a wasteful number, since it uses less digits than its factorization.

20112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72801 (or 72794 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20112120021 its reverse (12002121102), we get a palindrome (32114241123).

The spelling of 20112120021 in words is "twenty billion, one hundred twelve million, one hundred twenty thousand, twenty-one".