20112121121220 has 72 divisors (see below), whose sum is σ = 63266277320064. Its totient is φ = 5363232297696.

The previous prime is 20112121121203. The next prime is 20112121121231. The reversal of 20112121121220 is 2212112121102.

20112121121220 is a `hidden beast` number, since 201 + 1 + 2 + 121 + 121 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20112121121193 and 20112121121202.

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 23 ways as a sum of consecutive naturals, for example, 2069143404 + ... + 2069153123.

It is an arithmetic number, because the mean of its divisors is an integer number (878698296112).

Almost surely, 2^{20112121121220} is an apocalyptic number.

20112121121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20112121121220 is an abundant number, since it is smaller than the sum of its proper divisors (43154156198844).

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

20112121121220 is a wasteful number, since it uses less digits than its factorization.

20112121121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4138296551 (or 4138296537 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20112121121220 its reverse (2212112121102), we get a palindrome (22324233242322).

The spelling of 20112121121220 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty".