12011121011 has 4 divisors (see below), whose sum is σ = 12304075224. Its totient is φ = 11718166800.

The previous prime is 12011120987. The next prime is 12011121013. The reversal of 12011121011 is 11012111021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11012111021 = 3457 ⋅3185453.

It is a cyclic number.

It is not a de Polignac number, because 12011121011 - 2²² = 12006926707 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011120983 and 12011121001.

It is not an unprimeable number, because it can be changed into a prime (12011121013) 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, 146477045 + ... + 146477126.

It is an arithmetic number, because the mean of its divisors is an integer number (3076018806).

Almost surely, 2^12011121011 is an apocalyptic number.

12011121011 is a deficient number, since it is larger than the sum of its proper divisors (292954213).

12011121011 is an equidigital number, since it uses as much as digits as its factorization.

12011121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292954212.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12011121011 its reverse (11012111021), we get a palindrome (23023232032).

The spelling of 12011121011 in words is "twelve billion, eleven million, one hundred twenty-one thousand, eleven".