21112001212012 has 36 divisors (see below), whose sum is σ = 39272910100200. Its totient is φ = 9928535217664.

The previous prime is 21112001211947. The next prime is 21112001212031. The reversal of 21112001212012 is 21021210021112.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4235137 + ... + 7756312.

It is an arithmetic number, because the mean of its divisors is an integer number (1090914169450).

Almost surely, 2^{21112001212012} is an apocalyptic number.

It is an amenable number.

21112001212012 is a deficient number, since it is larger than the sum of its proper divisors (18160908888188).

21112001212012 is a wasteful number, since it uses less digits than its factorization.

21112001212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11993010 (or 11992991 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21112001212012 its reverse (21021210021112), we get a palindrome (42133211233124).

The spelling of 21112001212012 in words is "twenty-one trillion, one hundred twelve billion, one million, two hundred twelve thousand, twelve".