21112001212001 has 16 divisors (see below), whose sum is σ = 24206128800000. Its totient is φ = 18037444022208.

The previous prime is 21112001211947. The next prime is 21112001212031. The reversal of 21112001212001 is 10021210021112.

It is a cyclic number.

It is not a de Polignac number, because 21112001212001 - 2¹⁰ = 21112001210977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112001212031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4974500 + ... + 8183498.

It is an arithmetic number, because the mean of its divisors is an integer number (1512883050000).

Almost surely, 2^{21112001212001} is an apocalyptic number.

It is an amenable number.

21112001212001 is a deficient number, since it is larger than the sum of its proper divisors (3094127587999).

21112001212001 is a wasteful number, since it uses less digits than its factorization.

21112001212001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212048.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112001212001 its reverse (10021210021112), we get a palindrome (31133211233113).

The spelling of 21112001212001 in words is "twenty-one trillion, one hundred twelve billion, one million, two hundred twelve thousand, one".