12010021021 has 4 divisors (see below), whose sum is σ = 12532195872. Its totient is φ = 11487846172.

The previous prime is 12010020989. The next prime is 12010021027. The reversal of 12010021021 is 12012001021.

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: 12012001021 = 104761 ⋅114661.

It is a cyclic number.

It is not a de Polignac number, because 12010021021 - 2⁵ = 12010020989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12010020989 and 12010021007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12010021027) 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, 261087391 + ... + 261087436.

It is an arithmetic number, because the mean of its divisors is an integer number (3133048968).

Almost surely, 2^12010021021 is an apocalyptic number.

It is an amenable number.

12010021021 is a deficient number, since it is larger than the sum of its proper divisors (522174851).

12010021021 is an equidigital number, since it uses as much as digits as its factorization.

12010021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522174850.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12010021021 its reverse (12012001021), we get a palindrome (24022022042).

The spelling of 12010021021 in words is "twelve billion, ten million, twenty-one thousand, twenty-one".