21312122003121 has 16 divisors (see below), whose sum is σ = 28446283656000. Its totient is φ = 14193026622528.

The previous prime is 21312122003099. The next prime is 21312122003149. The reversal of 21312122003121 is 12130022121312.

It is not a de Polignac number, because 21312122003121 - 2⁹ = 21312122002609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21312122003021) 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 15 ways as a sum of consecutive naturals, for example, 14083330 + ... + 15523028.

It is an arithmetic number, because the mean of its divisors is an integer number (1777892728500).

Almost surely, 2^{21312122003121} is an apocalyptic number.

It is an amenable number.

21312122003121 is a deficient number, since it is larger than the sum of its proper divisors (7134161652879).

21312122003121 is a wasteful number, since it uses less digits than its factorization.

21312122003121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444928.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21312122003121 its reverse (12130022121312), we get a palindrome (33442144124433).

The spelling of 21312122003121 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, three thousand, one hundred twenty-one".