12001424021 has 4 divisors (see below), whose sum is σ = 12002438700. Its totient is φ = 12000409344.

The previous prime is 12001423997. The next prime is 12001424027. The reversal of 12001424021 is 12042410021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5196823921 + 6804600100 = 72089^2 + 82490^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001424021 - 2¹⁰ = 12001422997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001424027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489386 + ... + 513323.

It is an arithmetic number, because the mean of its divisors is an integer number (3000609675).

Almost surely, 2^12001424021 is an apocalyptic number.

It is an amenable number.

12001424021 is a deficient number, since it is larger than the sum of its proper divisors (1014679).

12001424021 is a wasteful number, since it uses less digits than its factorization.

12001424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014678.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 12001424021 its reverse (12042410021), we get a palindrome (24043834042).

The spelling of 12001424021 in words is "twelve billion, one million, four hundred twenty-four thousand, twenty-one".