12002121021 has 16 divisors (see below), whose sum is σ = 17499117888. Its totient is φ = 7256726400.

The previous prime is 12002121011. The next prime is 12002121037. The reversal of 12002121021 is 12012120021.

It is not a de Polignac number, because 12002121021 - 2¹⁴ = 12002104637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12002120988 and 12002121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12002121011) 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 15 ways as a sum of consecutive naturals, for example, 418056 + ... + 445841.

It is an arithmetic number, because the mean of its divisors is an integer number (1093694868).

Almost surely, 2^12002121021 is an apocalyptic number.

12002121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12002121021 is a deficient number, since it is larger than the sum of its proper divisors (5496996867).

12002121021 is a wasteful number, since it uses less digits than its factorization.

12002121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864332.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12002121021 its reverse (12012120021), we get a palindrome (24014241042).

The spelling of 12002121021 in words is "twelve billion, two million, one hundred twenty-one thousand, twenty-one".