1220220100 has 36 divisors (see below), whose sum is σ = 2888596368. Its totient is φ = 443716000.

The previous prime is 1220220083. The next prime is 1220220137. The reversal of 1220220100 is 10220221.

1220220100 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553546 + ... + 555745.

It is an arithmetic number, because the mean of its divisors is an integer number (80238788).

Almost surely, 2^1220220100 is an apocalyptic number.

1220220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220220100 is an abundant number, since it is smaller than the sum of its proper divisors (1668376268).

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

1220220100 is a wasteful number, since it uses less digits than its factorization.

1220220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1109316 (or 1109309 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1220220100 is about 34931.6489733880. The cubic root of 1220220100 is about 1068.5939840428.

Adding to 1220220100 its reverse (10220221), we get a palindrome (1230440321).

The spelling of 1220220100 in words is "one billion, two hundred twenty million, two hundred twenty thousand, one hundred".