12111022021 has 16 divisors (see below), whose sum is σ = 14667690240. Its totient is φ = 9778446720.

The previous prime is 12111022019. The next prime is 12111022043. The reversal of 12111022021 is 12022011121.

It is not a de Polignac number, because 12111022021 - 2¹ = 12111022019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111021992 and 12111022010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111122021) 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, 719241 + ... + 735886.

It is an arithmetic number, because the mean of its divisors is an integer number (916730640).

Almost surely, 2^12111022021 is an apocalyptic number.

It is an amenable number.

12111022021 is a deficient number, since it is larger than the sum of its proper divisors (2556668219).

12111022021 is a wasteful number, since it uses less digits than its factorization.

12111022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455204.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12111022021 its reverse (12022011121), we get a palindrome (24133033142).

The spelling of 12111022021 in words is "twelve billion, one hundred eleven million, twenty-two thousand, twenty-one".