12010001021 has 4 divisors (see below), whose sum is σ = 12046285344. Its totient is φ = 11973716700.

The previous prime is 12010000957. The next prime is 12010001027.

12010001021 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 12010001021 - 2⁶ = 12010000957 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 (12010001027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18141665 + ... + 18142326.

It is an arithmetic number, because the mean of its divisors is an integer number (3011571336).

Almost surely, 2^12010001021 is an apocalyptic number.

It is an amenable number.

12010001021 is a deficient number, since it is larger than the sum of its proper divisors (36284323).

12010001021 is an equidigital number, since it uses as much as digits as its factorization.

12010001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36284322.

The product of its (nonzero) digits is 4, while the sum is 8.

It can be divided in two parts, 1201000 and 1021, that added together give a palindrome (1202021).

The spelling of 12010001021 in words is "twelve billion, ten million, one thousand, twenty-one".