20011121121020 has 24 divisors (see below), whose sum is σ = 42023446920000. Its totient is φ = 8004430816832.

The previous prime is 20011121121001. The next prime is 20011121121041. The reversal of 20011121121020 is 2012112111002.

It is a junction number, because it is equal to n+sod(n) for n = 20011121120986 and 20011121121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12009806 + ... + 13574154.

It is an arithmetic number, because the mean of its divisors is an integer number (1750976955000).

Almost surely, 2^{20011121121020} is an apocalyptic number.

20011121121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20011121121020 is an abundant number, since it is smaller than the sum of its proper divisors (22012325798980).

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

20011121121020 is a wasteful number, since it uses less digits than its factorization.

20011121121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2203957 (or 2203955 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011121121020 its reverse (2012112111002), we get a palindrome (22023233232022).

The spelling of 20011121121020 in words is "twenty trillion, eleven billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty".