21111212010212 has 6 divisors (see below), whose sum is σ = 36944621017878. Its totient is φ = 10555606005104.

The previous prime is 21111212010193. The next prime is 21111212010223. The reversal of 21111212010212 is 21201021211112.

It can be written as a sum of positive squares in only one way, i.e., 18213570565696 + 2897641444516 = 4267736^2 + 1702246^2 .

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 as a sum of consecutive naturals, namely, 2638901501273 + ... + 2638901501280.

It is an arithmetic number, because the mean of its divisors is an integer number (6157436836313).

Almost surely, 2^{21111212010212} is an apocalyptic number.

It is an amenable number.

21111212010212 is a deficient number, since it is larger than the sum of its proper divisors (15833409007666).

21111212010212 is a wasteful number, since it uses less digits than its factorization.

21111212010212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5277803002557 (or 5277803002555 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111212010212 its reverse (21201021211112), we get a palindrome (42312233221324).

The spelling of 21111212010212 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, two hundred twelve".