20111021122120 has 48 divisors (see below), whose sum is σ = 45935248198140. Its totient is φ = 7924342580352.

The previous prime is 20111021122099. The next prime is 20111021122121. The reversal of 20111021122120 is 2122112011102.

It can be written as a sum of positive squares in 2 ways, for example, as 18422585959716 + 1688435162404 = 4292154^2 + 1299398^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20111021122094 and 20111021122103.

It is not an unprimeable number, because it can be changed into a prime (20111021122121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55821279 + ... + 56180398.

Almost surely, 2^{20111021122120} is an apocalyptic number.

20111021122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20111021122120 is an abundant number, since it is smaller than the sum of its proper divisors (25824227076020).

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

20111021122120 is a wasteful number, since it uses less digits than its factorization.

20111021122120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112001822 (or 112001751 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20111021122120 its reverse (2122112011102), we get a palindrome (22233133133222).

The spelling of 20111021122120 in words is "twenty trillion, one hundred eleven billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty".