2111211221020 has 36 divisors (see below), whose sum is σ = 4873233840552. Its totient is φ = 767713170400.

The previous prime is 2111211221011. The next prime is 2111211221033. The reversal of 2111211221020 is 201221121112.

It is a junction number, because it is equal to n+sod(n) for n = 2111211220985 and 2111211221003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 436198246 + ... + 436203085.

It is an arithmetic number, because the mean of its divisors is an integer number (135367606682).

Almost surely, 2^{2111211221020} is an apocalyptic number.

2111211221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111211221020 is an abundant number, since it is smaller than the sum of its proper divisors (2762022619532).

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

2111211221020 is a wasteful number, since it uses less digits than its factorization.

2111211221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872401362 (or 872401349 counting only the distinct ones).

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

Adding to 2111211221020 its reverse (201221121112), we get a palindrome (2312432342132).

The spelling of 2111211221020 in words is "two trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, twenty".