1220212100 has 36 divisors (see below), whose sum is σ = 2762989824. Its totient is φ = 466862880.

The previous prime is 1220212093. The next prime is 1220212109. The reversal of 1220212100 is 12120221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1220212109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 262964 + ... + 267563.

Almost surely, 2^1220212100 is an apocalyptic number.

1220212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220212100 is an abundant number, since it is smaller than the sum of its proper divisors (1542777724).

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

1220212100 is a wasteful number, since it uses less digits than its factorization.

1220212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530564 (or 530557 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1220212100 is about 34931.5344638623. The cubic root of 1220212100 is about 1068.5916487345.

Adding to 1220212100 its reverse (12120221), we get a palindrome (1232332321).

The spelling of 1220212100 in words is "one billion, two hundred twenty million, two hundred twelve thousand, one hundred".