12001021101 has 16 divisors (see below), whose sum is σ = 17793113920. Its totient is φ = 7994460240.

The previous prime is 12001021079. The next prime is 12001021127. The reversal of 12001021101 is 10112010021.

It is a happy number.

It is not a de Polignac number, because 12001021101 - 2¹⁰ = 12001020077 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001028101) 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, 137290 + ... + 207003.

It is an arithmetic number, because the mean of its divisors is an integer number (1112069620).

Almost surely, 2^12001021101 is an apocalyptic number.

It is an amenable number.

12001021101 is a deficient number, since it is larger than the sum of its proper divisors (5792092819).

12001021101 is a wasteful number, since it uses less digits than its factorization.

12001021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345593 (or 345587 counting only the distinct ones).

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

Adding to 12001021101 its reverse (10112010021), we get a palindrome (22113031122).

The spelling of 12001021101 in words is "twelve billion, one million, twenty-one thousand, one hundred one".