12001000021121 has 32 divisors (see below), whose sum is σ = 13918771468800. Its totient is φ = 10274582626560.

The previous prime is 12001000021111. The next prime is 12001000021141. The reversal of 12001000021121 is 12112000010021.

It is a cyclic number.

It is not a de Polignac number, because 12001000021121 - 2¹⁸ = 12000999758977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12001000021111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6503135 + ... + 8142036.

It is an arithmetic number, because the mean of its divisors is an integer number (434961608400).

Almost surely, 2^{12001000021121} is an apocalyptic number.

It is an amenable number.

12001000021121 is a deficient number, since it is larger than the sum of its proper divisors (1917771447679).

12001000021121 is a wasteful number, since it uses less digits than its factorization.

12001000021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14645309.

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

Adding to 12001000021121 its reverse (12112000010021), we get a palindrome (24113000031142).

The spelling of 12001000021121 in words is "twelve trillion, one billion, twenty-one thousand, one hundred twenty-one".