21212120120012 has 6 divisors (see below), whose sum is σ = 37121210210028. Its totient is φ = 10606060060004.

The previous prime is 21212120120011. The next prime is 21212120120021. The reversal of 21212120120012 is 21002102121212.

It is not an unprimeable number, because it can be changed into a prime (21212120120011) by changing a digit.

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, 2651515014998 + ... + 2651515015005.

It is an arithmetic number, because the mean of its divisors is an integer number (6186868368338).

Almost surely, 2^{21212120120012} is an apocalyptic number.

It is an amenable number.

21212120120012 is a deficient number, since it is larger than the sum of its proper divisors (15909090090016).

21212120120012 is a wasteful number, since it uses less digits than its factorization.

21212120120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303030030007 (or 5303030030005 counting only the distinct ones).

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

Adding to 21212120120012 its reverse (21002102121212), we get a palindrome (42214222241224).

The spelling of 21212120120012 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty thousand, twelve".