1220221013100 has 72 divisors (see below), whose sum is σ = 3625925248848. Its totient is φ = 316597881600.

The previous prime is 1220221013083. The next prime is 1220221013119. The reversal of 1220221013100 is 13101220221.

It is a super-2 number, since 2×1220221013100² (a number of 25 digits) contains 22 as substring.

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 1220221013100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54953811 + ... + 54976010.

Almost surely, 2^{1220221013100} is an apocalyptic number.

1220221013100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221013100 is an abundant number, since it is smaller than the sum of its proper divisors (2405704235748).

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

1220221013100 is a wasteful number, since it uses less digits than its factorization.

1220221013100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109929875 (or 109929868 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1220221013100 its reverse (13101220221), we get a palindrome (1233322233321).

The spelling of 1220221013100 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, thirteen thousand, one hundred".