1121222221020 has 144 divisors (see below), whose sum is σ = 3743060866272. Its totient is φ = 269405982720.

The previous prime is 1121222221019. The next prime is 1121222221043. The reversal of 1121222221020 is 201222221211.

It is a happy number.

1121222221020 is a `hidden beast` number, since 1 + 1 + 212 + 222 + 210 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1121222220984 and 1121222221002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2281897 + ... + 2729376.

It is an arithmetic number, because the mean of its divisors is an integer number (25993478238).

Almost surely, 2^{1121222221020} is an apocalyptic number.

1121222221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121222221020 is an abundant number, since it is smaller than the sum of its proper divisors (2621838645252).

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

1121222221020 is a wasteful number, since it uses less digits than its factorization.

1121222221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011412 (or 5011407 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1121222221020 its reverse (201222221211), we get a palindrome (1322444442231).

The spelling of 1121222221020 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, twenty".