1220111023220 has 48 divisors (see below), whose sum is σ = 2713082834448. Its totient is φ = 459313889280.

The previous prime is 1220111023207. The next prime is 1220111023231. The reversal of 1220111023220 is 223201110221.

It can be written as a sum of positive squares in 8 ways, for example, as 284801534224 + 935309488996 = 533668^2 + 967114^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8181644 + ... + 8329436.

It is an arithmetic number, because the mean of its divisors is an integer number (56522559051).

Almost surely, 2^{1220111023220} is an apocalyptic number.

1220111023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220111023220 is an abundant number, since it is smaller than the sum of its proper divisors (1492971811228).

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

1220111023220 is a wasteful number, since it uses less digits than its factorization.

1220111023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172100 (or 172098 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 1220111023220 its reverse (223201110221), we get a palindrome (1443312133441).

The spelling of 1220111023220 in words is "one trillion, two hundred twenty billion, one hundred eleven million, twenty-three thousand, two hundred twenty".