21111212200012 has 24 divisors (see below), whose sum is σ = 40303341004752. Its totient is φ = 9595977518400.

The previous prime is 21111212199997. The next prime is 21111212200031. The reversal of 21111212200012 is 21000221211112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25780962 + ... + 26587222.

It is an arithmetic number, because the mean of its divisors is an integer number (1679305875198).

Almost surely, 2^{21111212200012} is an apocalyptic number.

21111212200012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21111212200012 is a deficient number, since it is larger than the sum of its proper divisors (19192128804740).

21111212200012 is a wasteful number, since it uses less digits than its factorization.

21111212200012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401369 (or 1401367 counting only the distinct ones).

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

Adding to 21111212200012 its reverse (21000221211112), we get a palindrome (42111433411124).

The spelling of 21111212200012 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, two hundred thousand, twelve".