20011100021120 has 128 divisors (see below), whose sum is σ = 53180864513280. Its totient is φ = 7150368153600.

The previous prime is 20011100021113. The next prime is 20011100021197. The reversal of 20011100021120 is 2112000111002.

It is a tau number, because it is divible by the number of its divisors (128).

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, 38535311 + ... + 39051150.

It is an arithmetic number, because the mean of its divisors is an integer number (415475504010).

Almost surely, 2^{20011100021120} is an apocalyptic number.

20011100021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011100021120 is an abundant number, since it is smaller than the sum of its proper divisors (33169764492160).

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

20011100021120 is a wasteful number, since it uses less digits than its factorization.

20011100021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77586524 (or 77586512 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20011100021120 its reverse (2112000111002), we get a palindrome (22123100132122).

The spelling of 20011100021120 in words is "twenty trillion, eleven billion, one hundred million, twenty-one thousand, one hundred twenty".