1222020221100 has 144 divisors (see below), whose sum is σ = 4064172043008. Its totient is φ = 277704264960.

The previous prime is 1222020221099. The next prime is 1222020221111. The reversal of 1222020221100 is 11220202221.

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 1222020221100.

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, 1318534 + ... + 2045133.

Almost surely, 2^{1222020221100} is an apocalyptic number.

1222020221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222020221100 is an abundant number, since it is smaller than the sum of its proper divisors (2842151821908).

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

1222020221100 is a wasteful number, since it uses less digits than its factorization.

1222020221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363864 (or 3363857 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1222020221100 its reverse (11220202221), we get a palindrome (1233240423321).

The spelling of 1222020221100 in words is "one trillion, two hundred twenty-two billion, twenty million, two hundred twenty-one thousand, one hundred".