12011021021 has 6 divisors (see below), whose sum is σ = 12410972766. Its totient is φ = 11623567800.

The previous prime is 12011021003. The next prime is 12011021027. The reversal of 12011021021 is 12012011021.

It can be written as a sum of positive squares in only one way, i.e., 11405172025 + 605848996 = 106795^2 + 24614^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12011021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011020993 and 12011021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011021027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6248270 + ... + 6250191.

It is an arithmetic number, because the mean of its divisors is an integer number (2068495461).

Almost surely, 2^12011021021 is an apocalyptic number.

It is an amenable number.

12011021021 is a deficient number, since it is larger than the sum of its proper divisors (399951745).

12011021021 is an equidigital number, since it uses as much as digits as its factorization.

12011021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12498523 (or 12498492 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12011021021 its reverse (12012011021), we get a palindrome (24023032042).

The spelling of 12011021021 in words is "twelve billion, eleven million, twenty-one thousand, twenty-one".