1001101221220 has 12 divisors (see below), whose sum is σ = 2102312564604. Its totient is φ = 400440488480.

The previous prime is 1001101221209. The next prime is 1001101221233. The reversal of 1001101221220 is 221221011001.

It can be written as a sum of positive squares in 2 ways, for example, as 337488959844 + 663612261376 = 580938^2 + 814624^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1001101221220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25027530511 + ... + 25027530550.

It is an arithmetic number, because the mean of its divisors is an integer number (175192713717).

Almost surely, 2^{1001101221220} is an apocalyptic number.

1001101221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001101221220 is an abundant number, since it is smaller than the sum of its proper divisors (1101211343384).

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

1001101221220 is a wasteful number, since it uses less digits than its factorization.

1001101221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50055061070 (or 50055061068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001101221220 its reverse (221221011001), we get a palindrome (1222322232221).

The spelling of 1001101221220 in words is "one trillion, one billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty".