12020021001 has 36 divisors (see below), whose sum is σ = 18072327312. Its totient is φ = 7994149848.

The previous prime is 12020020981. The next prime is 12020021011. The reversal of 12020021001 is 10012002021.

It is not a de Polignac number, because 12020021001 - 2²⁶ = 11952912137 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12020021011) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3062026 + ... + 3065948.

It is an arithmetic number, because the mean of its divisors is an integer number (502009092).

Almost surely, 2^12020021001 is an apocalyptic number.

It is an amenable number.

12020021001 is a deficient number, since it is larger than the sum of its proper divisors (6052306311).

12020021001 is an frugal number, since it uses more digits than its factorization.

12020021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4414 (or 4393 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 12020021001 its reverse (10012002021), we get a palindrome (22032023022).

The spelling of 12020021001 in words is "twelve billion, twenty million, twenty-one thousand, one".