12101021011 has 4 divisors (see below), whose sum is σ = 12104303224. Its totient is φ = 12097738800.

The previous prime is 12101020949. The next prime is 12101021041. The reversal of 12101021011 is 11012010121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12101021011 - 2¹⁵ = 12100988243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12101021041) 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, 1635570 + ... + 1642951.

It is an arithmetic number, because the mean of its divisors is an integer number (3026075806).

Almost surely, 2^12101021011 is an apocalyptic number.

12101021011 is a deficient number, since it is larger than the sum of its proper divisors (3282213).

12101021011 is an equidigital number, since it uses as much as digits as its factorization.

12101021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282212.

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

Adding to 12101021011 its reverse (11012010121), we get a palindrome (23113031132).

The spelling of 12101021011 in words is "twelve billion, one hundred one million, twenty-one thousand, eleven".