12011000010021 has 20 divisors (see below), whose sum is σ = 17949020956812. Its totient is φ = 8004359806848.

The previous prime is 12011000009993. The next prime is 12011000010067. The reversal of 12011000010021 is 12001000011021.

It is a happy number.

12011000010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6549248722500 + 5461751287521 = 2559150^2 + 2337039^2 .

It is not a de Polignac number, because 12011000010021 - 2¹⁷ = 12010999878949 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 12011000009985 and 12011000010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011000010091) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27313236 + ... + 27749501.

Almost surely, 2^{12011000010021} is an apocalyptic number.

It is an amenable number.

12011000010021 is a deficient number, since it is larger than the sum of its proper divisors (5938020946791).

12011000010021 is an equidigital number, since it uses as much as digits as its factorization.

12011000010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55065442 (or 55065433 counting only the distinct ones).

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

Adding to 12011000010021 its reverse (12001000011021), we get a palindrome (24012000021042).

The spelling of 12011000010021 in words is "twelve trillion, eleven billion, ten thousand, twenty-one".