1121222021100 has 72 divisors (see below), whose sum is σ = 3244948799568. Its totient is φ = 298911456000.

The previous prime is 1121222021011. The next prime is 1121222021107. The reversal of 1121222021100 is 11202221211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1121222021100.

It is not an unprimeable number, because it can be changed into a prime (1121222021107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 605382 + ... + 1615218.

Almost surely, 2^{1121222021100} is an apocalyptic number.

1121222021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121222021100 is an abundant number, since it is smaller than the sum of its proper divisors (2123726778468).

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

1121222021100 is a wasteful number, since it uses less digits than its factorization.

1121222021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013555 (or 1013548 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1121222021100 its reverse (11202221211), we get a palindrome (1132424242311).

The spelling of 1121222021100 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, one hundred".