12110021001 has 18 divisors (see below), whose sum is σ = 18941317278. Its totient is φ = 7452319680.

The previous prime is 12110020981. The next prime is 12110021029. The reversal of 12110021001 is 10012001121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 174240000 + 11935781001 = 13200^2 + 109251^2 .

It is not a de Polignac number, because 12110021001 - 2¹¹ = 12110018953 is a prime.

It is a super-2 number, since 2×12110021001² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12110023001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3979420 + ... + 3982461.

Almost surely, 2^12110021001 is an apocalyptic number.

It is an amenable number.

12110021001 is a deficient number, since it is larger than the sum of its proper divisors (6831296277).

12110021001 is a wasteful number, since it uses less digits than its factorization.

12110021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961913 (or 7961897 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12110021001 its reverse (10012001121), we get a palindrome (22122022122).

The spelling of 12110021001 in words is "twelve billion, one hundred ten million, twenty-one thousand, one".