12120111000021 has 12 divisors (see below), whose sum is σ = 16893311616608. Its totient is φ = 7728766433784.

The previous prime is 12120111000013. The next prime is 12120111000037. The reversal of 12120111000021 is 12000011102121.

It is not a de Polignac number, because 12120111000021 - 2³ = 12120111000013 is a prime.

It is a super-3 number, since 3×12120111000021³ (a number of 40 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120110999970 and 12120111000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120111000061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3818558905 + ... + 3818562078.

Almost surely, 2^{12120111000021} is an apocalyptic number.

It is an amenable number.

12120111000021 is a deficient number, since it is larger than the sum of its proper divisors (4773200616587).

12120111000021 is an equidigital number, since it uses as much as digits as its factorization.

12120111000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7637121032 (or 7637121009 counting only the distinct ones).

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

Adding to 12120111000021 its reverse (12000011102121), we get a palindrome (24120122102142).

The spelling of 12120111000021 in words is "twelve trillion, one hundred twenty billion, one hundred eleven million, twenty-one", and thus it is an aban number.