20113121222100 has 54 divisors (see below), whose sum is σ = 63043461077870. Its totient is φ = 5363498992320.

The previous prime is 20113121222071. The next prime is 20113121222143. The reversal of 20113121222100 is 122212131102.

20113121222100 is a `hidden beast` number, since 20 + 1 + 1 + 312 + 122 + 210 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 493023048336 + 19620098173764 = 702156^2 + 4429458^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 11173955335 + ... + 11173957134.

Almost surely, 2^{20113121222100} is an apocalyptic number.

20113121222100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20113121222100 is an abundant number, since it is smaller than the sum of its proper divisors (42930339855770).

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

20113121222100 is a wasteful number, since it uses less digits than its factorization.

20113121222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22347912489 (or 22347912479 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20113121222100 its reverse (122212131102), we get a palindrome (20235333353202).

The spelling of 20113121222100 in words is "twenty trillion, one hundred thirteen billion, one hundred twenty-one million, two hundred twenty-two thousand, one hundred".