12010021121 has 4 divisors (see below), whose sum is σ = 13725738432. Its totient is φ = 10294303812.

The previous prime is 12010021043. The next prime is 12010021151. The reversal of 12010021121 is 12112001021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12112001021 = 233 ⋅51982837.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12010021121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12010021151) 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, 857858645 + ... + 857858658.

It is an arithmetic number, because the mean of its divisors is an integer number (3431434608).

Almost surely, 2^12010021121 is an apocalyptic number.

It is an amenable number.

12010021121 is a deficient number, since it is larger than the sum of its proper divisors (1715717311).

12010021121 is an equidigital number, since it uses as much as digits as its factorization.

12010021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715717310.

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

Adding to 12010021121 its reverse (12112001021), we get a palindrome (24122022142).

The spelling of 12010021121 in words is "twelve billion, ten million, twenty-one thousand, one hundred twenty-one".