12011011021 has 2 divisors, whose sum is σ = 12011011022. Its totient is φ = 12011011020.

The previous prime is 12011011009. The next prime is 12011011057.

12011011021 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11967266025 + 43744996 = 109395^2 + 6614^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 12011011021 - 2²¹ = 12008913869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12011010989 and 12011011007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12011011321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005505510 + 6005505511.

It is an arithmetic number, because the mean of its divisors is an integer number (6005505511).

Almost surely, 2^12011011021 is an apocalyptic number.

It is an amenable number.

12011011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011011021 is an equidigital number, since it uses as much as digits as its factorization.

12011011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

It can be divided in two parts, 120110 and 11021, that added together give a palindrome (131131).

The spelling of 12011011021 in words is "twelve billion, eleven million, eleven thousand, twenty-one".