12002100021 has 8 divisors (see below), whose sum is σ = 17780888960. Its totient is φ = 8001399996.

The previous prime is 12002099999. The next prime is 12002100031. The reversal of 12002100021 is 12000120021.

It is not a de Polignac number, because 12002100021 - 2⁹ = 12002099509 is a prime.

It is a super-3 number, since 3×12002100021³ (a number of 31 digits) contains 333 as substring.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12002099976 and 12002100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002100031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222261085 + ... + 222261138.

It is an arithmetic number, because the mean of its divisors is an integer number (2222611120).

Almost surely, 2^12002100021 is an apocalyptic number.

It is an amenable number.

12002100021 is a deficient number, since it is larger than the sum of its proper divisors (5778788939).

12002100021 is an equidigital number, since it uses as much as digits as its factorization.

12002100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444522232 (or 444522226 counting only the distinct ones).

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

Adding to 12002100021 its reverse (12000120021), we get a palindrome (24002220042).

The spelling of 12002100021 in words is "twelve billion, two million, one hundred thousand, twenty-one".