20121222100100 has 72 divisors (see below), whose sum is σ = 47639176939200. Its totient is φ = 7315770153600.

The previous prime is 20121222100097. The next prime is 20121222100163. The reversal of 20121222100100 is 100122212102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6482081 + ... + 9069719.

Almost surely, 2^{20121222100100} is an apocalyptic number.

20121222100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121222100100 is an abundant number, since it is smaller than the sum of its proper divisors (27517954839100).

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

20121222100100 is a wasteful number, since it uses less digits than its factorization.

20121222100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594733 (or 2594726 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20121222100100 its reverse (100122212102), we get a palindrome (20221344312202).

The spelling of 20121222100100 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, one hundred".