21212210020112 has 10 divisors (see below), whose sum is σ = 41098656913998. Its totient is φ = 10606105010048.

The previous prime is 21212210020049. The next prime is 21212210020139. The reversal of 21212210020112 is 21102001221212.

It can be written as a sum of positive squares in only one way, i.e., 12916519729936 + 8295690290176 = 3593956^2 + 2880224^2 .

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, 662881563113 + ... + 662881563144.

Almost surely, 2^{21212210020112} is an apocalyptic number.

It is an amenable number.

21212210020112 is a deficient number, since it is larger than the sum of its proper divisors (19886446893886).

21212210020112 is a wasteful number, since it uses less digits than its factorization.

21212210020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325763126265 (or 1325763126259 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212210020112 its reverse (21102001221212), we get a palindrome (42314211241324).

The spelling of 21212210020112 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, twenty thousand, one hundred twelve".