20121220100212 has 48 divisors (see below), whose sum is σ = 44005121677440. Its totient is φ = 7820815363200.

The previous prime is 20121220100197. The next prime is 20121220100357. The reversal of 20121220100212 is 21200102212102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77457787 + ... + 77717122.

It is an arithmetic number, because the mean of its divisors is an integer number (916773368280).

Almost surely, 2^{20121220100212} is an apocalyptic number.

20121220100212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20121220100212 is an abundant number, since it is smaller than the sum of its proper divisors (23883901577228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20121220100212 is a wasteful number, since it uses less digits than its factorization.

20121220100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155175352 (or 155175350 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20121220100212 its reverse (21200102212102), we get a palindrome (41321322312314).

The spelling of 20121220100212 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thousand, two hundred twelve".