12021031111 has 4 divisors (see below), whose sum is σ = 12021525712. Its totient is φ = 12020536512.

The previous prime is 12021031103. The next prime is 12021031147. The reversal of 12021031111 is 11113012021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11113012021 = 26959 ⋅412219.

It is a cyclic number.

It is not a de Polignac number, because 12021031111 - 2³ = 12021031103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021031091 and 12021031100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021031171) 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, 208851 + ... + 260116.

It is an arithmetic number, because the mean of its divisors is an integer number (3005381428).

Almost surely, 2^12021031111 is an apocalyptic number.

12021031111 is a deficient number, since it is larger than the sum of its proper divisors (494601).

12021031111 is an equidigital number, since it uses as much as digits as its factorization.

12021031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494600.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 12021031111 its reverse (11113012021), we get a palindrome (23134043132).

It can be divided in two parts, 120210 and 31111, that added together give a square (151321 = 389²).

The spelling of 12021031111 in words is "twelve billion, twenty-one million, thirty-one thousand, one hundred eleven".