21212010111112 has 8 divisors (see below), whose sum is σ = 39772518958350. Its totient is φ = 10606005055552.

The previous prime is 21212010111107. The next prime is 21212010111119. The reversal of 21212010111112 is 21111101021212.

It can be written as a sum of positive squares in only one way, i.e., 17016829521316 + 4195180589796 = 4125146^2 + 2048214^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21212010111119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325750631937 + ... + 1325750631952.

Almost surely, 2^{21212010111112} is an apocalyptic number.

It is an amenable number.

21212010111112 is a deficient number, since it is larger than the sum of its proper divisors (18560508847238).

21212010111112 is a wasteful number, since it uses less digits than its factorization.

21212010111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651501263895 (or 2651501263891 counting only the distinct ones).

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

Adding to 21212010111112 its reverse (21111101021212), we get a palindrome (42323111132324).

The spelling of 21212010111112 in words is "twenty-one trillion, two hundred twelve billion, ten million, one hundred eleven thousand, one hundred twelve".