1220432100 has 36 divisors (see below), whose sum is σ = 3531117744. Its totient is φ = 325448480.

The previous prime is 1220432077. The next prime is 1220432119. The reversal of 1220432100 is 12340221.

It is a super-3 number, since 3×1220432100³ (a number of 28 digits) contains 333 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 1220432100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2033754 + ... + 2034353.

It is an arithmetic number, because the mean of its divisors is an integer number (98086604).

Almost surely, 2^1220432100 is an apocalyptic number.

1220432100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220432100 is an abundant number, since it is smaller than the sum of its proper divisors (2310685644).

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

1220432100 is a wasteful number, since it uses less digits than its factorization.

1220432100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068124 (or 4068117 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1220432100 is about 34934.6833390543. The cubic root of 1220432100 is about 1068.6558659952.

Adding to 1220432100 its reverse (12340221), we get a palindrome (1232772321).

The spelling of 1220432100 in words is "one billion, two hundred twenty million, four hundred thirty-two thousand, one hundred".