2011121211020 has 24 divisors (see below), whose sum is σ = 4224223571568. Its totient is φ = 804282955200.

The previous prime is 2011121210981. The next prime is 2011121211037. The reversal of 2011121211020 is 201121211102.

It is a junction number, because it is equal to n+sod(n) for n = 2011121210986 and 2011121211004.

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, 10245926 + ... + 10440365.

It is an arithmetic number, because the mean of its divisors is an integer number (176009315482).

Almost surely, 2^{2011121211020} is an apocalyptic number.

2011121211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011121211020 is an abundant number, since it is smaller than the sum of its proper divisors (2213102360548).

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

2011121211020 is a wasteful number, since it uses less digits than its factorization.

2011121211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20691161 (or 20691159 counting only the distinct ones).

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

Adding to 2011121211020 its reverse (201121211102), we get a palindrome (2212242422122).

The spelling of 2011121211020 in words is "two trillion, eleven billion, one hundred twenty-one million, two hundred eleven thousand, twenty".