1220042100 has 36 divisors (see below), whose sum is σ = 3529989344. Its totient is φ = 325344480.

The previous prime is 1220042071. The next prime is 1220042113. The reversal of 1220042100 is 12400221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 2033104 + ... + 2033703.

Almost surely, 2^1220042100 is an apocalyptic number.

1220042100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220042100 is an abundant number, since it is smaller than the sum of its proper divisors (2309947244).

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

1220042100 is a wasteful number, since it uses less digits than its factorization.

1220042100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4066824 (or 4066817 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 1220042100 is about 34929.1010476937. The cubic root of 1220042100 is about 1068.5420210189.

Adding to 1220042100 its reverse (12400221), we get a palindrome (1232442321).

The spelling of 1220042100 in words is "one billion, two hundred twenty million, forty-two thousand, one hundred".