20121100200020 has 48 divisors (see below), whose sum is σ = 43729398840960. Its totient is φ = 7767699977856.

The previous prime is 20121100199909. The next prime is 20121100200031. The reversal of 20121100200020 is 2000200112102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20121100199974 and 20121100200010.

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, 5753462 + ... + 8564141.

It is an arithmetic number, because the mean of its divisors is an integer number (911029142520).

Almost surely, 2^{20121100200020} is an apocalyptic number.

20121100200020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121100200020 is an abundant number, since it is smaller than the sum of its proper divisors (23608298640940).

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

20121100200020 is a wasteful number, since it uses less digits than its factorization.

20121100200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14320064 (or 14320062 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20121100200020 its reverse (2000200112102), we get a palindrome (22121300312122).

The spelling of 20121100200020 in words is "twenty trillion, one hundred twenty-one billion, one hundred million, two hundred thousand, twenty".