12021110001 has 6 divisors (see below), whose sum is σ = 17363825570. Its totient is φ = 8014073328.

The previous prime is 12021109987. The next prime is 12021110027. The reversal of 12021110001 is 10001112021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11973830625 + 47279376 = 109425^2 + 6876^2 .

It is not a de Polignac number, because 12021110001 - 2⁶ = 12021109937 is a prime.

It is a super-2 number, since 2×12021110001² (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), and also a Moran number because the ratio is a prime number: 1335678889 = 12021110001 / (1 + 2 + 0 + 2 + 1 + 1 + 1 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021110081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 667839436 + ... + 667839453.

Almost surely, 2^12021110001 is an apocalyptic number.

It is an amenable number.

12021110001 is a deficient number, since it is larger than the sum of its proper divisors (5342715569).

12021110001 is a wasteful number, since it uses less digits than its factorization.

12021110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335678895 (or 1335678892 counting only the distinct ones).

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

Adding to 12021110001 its reverse (10001112021), we get a palindrome (22022222022).

The spelling of 12021110001 in words is "twelve billion, twenty-one million, one hundred ten thousand, one".