12111010021 has 8 divisors (see below), whose sum is σ = 13308450624. Its totient is φ = 10929642720.

The previous prime is 12111009991. The next prime is 12111010027. The reversal of 12111010021 is 12001011121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12111010021 - 2¹¹ = 12111007973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111010027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4016745 + ... + 4019758.

It is an arithmetic number, because the mean of its divisors is an integer number (1663556328).

Almost surely, 2^12111010021 is an apocalyptic number.

12111010021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12111010021 is a deficient number, since it is larger than the sum of its proper divisors (1197440603).

12111010021 is a wasteful number, since it uses less digits than its factorization.

12111010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8036651.

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

Adding to 12111010021 its reverse (12001011121), we get a palindrome (24112021142).

It can be divided in two parts, 121110 and 10021, that added together give a palindrome (131131).

The spelling of 12111010021 in words is "twelve billion, one hundred eleven million, ten thousand, twenty-one".