12001021511 has 4 divisors (see below), whose sum is σ = 12013306032. Its totient is φ = 11988736992.

The previous prime is 12001021457. The next prime is 12001021519. The reversal of 12001021511 is 11512010021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11512010021 = 54869 ⋅209809.

It is a cyclic number.

It is not a de Polignac number, because 12001021511 - 2³⁰ = 10927279687 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 (12001021519) 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, 6140795 + ... + 6142748.

It is an arithmetic number, because the mean of its divisors is an integer number (3003326508).

Almost surely, 2^12001021511 is an apocalyptic number.

12001021511 is a deficient number, since it is larger than the sum of its proper divisors (12284521).

12001021511 is an equidigital number, since it uses as much as digits as its factorization.

12001021511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12284520.

The product of its (nonzero) digits is 20, while the sum is 14.

Adding to 12001021511 its reverse (11512010021), we get a palindrome (23513031532).

The spelling of 12001021511 in words is "twelve billion, one million, twenty-one thousand, five hundred eleven".