12021010121 has 4 divisors (see below), whose sum is σ = 12115663872. Its totient is φ = 11926356372.

The previous prime is 12021010103. The next prime is 12021010163. The reversal of 12021010121 is 12101012021.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021010121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12021010171) 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, 47326685 + ... + 47326938.

It is an arithmetic number, because the mean of its divisors is an integer number (3028915968).

Almost surely, 2^12021010121 is an apocalyptic number.

It is an amenable number.

12021010121 is a deficient number, since it is larger than the sum of its proper divisors (94653751).

12021010121 is an equidigital number, since it uses as much as digits as its factorization.

12021010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94653750.

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

Adding to 12021010121 its reverse (12101012021), we get a palindrome (24122022142).

The spelling of 12021010121 in words is "twelve billion, twenty-one million, ten thousand, one hundred twenty-one".