1221222100200 has 96 divisors (see below), whose sum is σ = 3786353372160. Its totient is φ = 325610636800.

The previous prime is 1221222100093. The next prime is 1221222100243. The reversal of 1221222100200 is 20012221221.

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 1221222100200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3965785 + ... + 4262615.

It is an arithmetic number, because the mean of its divisors is an integer number (39441180960).

Almost surely, 2^{1221222100200} is an apocalyptic number.

1221222100200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221222100200 is an abundant number, since it is smaller than the sum of its proper divisors (2565131271960).

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

1221222100200 is a wasteful number, since it uses less digits than its factorization.

1221222100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303707 (or 303698 counting only the distinct ones).

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

Adding to 1221222100200 its reverse (20012221221), we get a palindrome (1241234321421).

The spelling of 1221222100200 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred".