2111122221020 has 36 divisors (see below), whose sum is σ = 4709482697640. Its totient is φ = 794775422208.

The previous prime is 2111122221001. The next prime is 2111122221059. The reversal of 2111122221020 is 201222211112.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 2111122221020.

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, 182617250 + ... + 182628809.

Almost surely, 2^{2111122221020} is an apocalyptic number.

2111122221020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111122221020 is an abundant number, since it is smaller than the sum of its proper divisors (2598360476620).

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

2111122221020 is a wasteful number, since it uses less digits than its factorization.

2111122221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365246102 (or 365246083 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2111122221020 its reverse (201222211112), we get a palindrome (2312344432132).

The spelling of 2111122221020 in words is "two trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, twenty".