21111001111212 has 48 divisors (see below), whose sum is σ = 49960475615232. Its totient is φ = 6936892997760.

The previous prime is 21111001111183. The next prime is 21111001111241. The reversal of 21111001111212 is 21211110011112.

It is an interprime number because it is at equal distance from previous prime (21111001111183) and next prime (21111001111241).

It is a junction number, because it is equal to n+sod(n) for n = 21111001111191 and 21111001111200.

It is an unprimeable number.

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, 4801228 + ... + 8079219.

It is an arithmetic number, because the mean of its divisors is an integer number (1040843241984).

Almost surely, 2^{21111001111212} is an apocalyptic number.

It is an amenable number.

21111001111212 is an abundant number, since it is smaller than the sum of its proper divisors (28849474504020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21111001111212 is a wasteful number, since it uses less digits than its factorization.

21111001111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12882398 (or 12882396 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111001111212 its reverse (21211110011112), we get a palindrome (42322111122324).

The spelling of 21111001111212 in words is "twenty-one trillion, one hundred eleven billion, one million, one hundred eleven thousand, two hundred twelve".