1201221000220 has 24 divisors (see below), whose sum is σ = 2522585558304. Its totient is φ = 480484312896.

The previous prime is 1201221000191. The next prime is 1201221000251. The reversal of 1201221000220 is 220001221021.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201221000220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3503902 + ... + 3831418.

It is an arithmetic number, because the mean of its divisors is an integer number (105107731596).

Almost surely, 2^{1201221000220} is an apocalyptic number.

1201221000220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201221000220 is an abundant number, since it is smaller than the sum of its proper divisors (1321364558084).

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

1201221000220 is a wasteful number, since it uses less digits than its factorization.

1201221000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510909 (or 510907 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1201221000220 its reverse (220001221021), we get a palindrome (1421222221241).

The spelling of 1201221000220 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty", and thus it is an aban number.