20121221212010 has 16 divisors (see below), whose sum is σ = 37792902450816. Its totient is φ = 7698554202768.

The previous prime is 20121221212009. The next prime is 20121221212087. The reversal of 20121221212010 is 1021212212102.

It is a self number, because there is not a number n which added to its sum of digits gives 20121221212010.

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 7 ways as a sum of consecutive naturals, for example, 43741785014 + ... + 43741785473.

It is an arithmetic number, because the mean of its divisors is an integer number (2362056403176).

Almost surely, 2^{20121221212010} is an apocalyptic number.

20121221212010 is a deficient number, since it is larger than the sum of its proper divisors (17671681238806).

20121221212010 is a wasteful number, since it uses less digits than its factorization.

20121221212010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87483570517.

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

Adding to 20121221212010 its reverse (1021212212102), we get a palindrome (21142433424112).

The spelling of 20121221212010 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, ten".