1200212100 has 72 divisors (see below), whose sum is σ = 3858468320. Its totient is φ = 320055840.

The previous prime is 1200212093. The next prime is 1200212119. The reversal of 1200212100 is 12120021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 219562 + ... + 224961.

Almost surely, 2^1200212100 is an apocalyptic number.

1200212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200212100 is an abundant number, since it is smaller than the sum of its proper divisors (2658256220).

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

1200212100 is a wasteful number, since it uses less digits than its factorization.

1200212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444546 (or 444533 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200212100 is about 34644.0774159163. The cubic root of 1200212100 is about 1062.7211737950.

Adding to 1200212100 its reverse (12120021), we get a palindrome (1212332121).

The spelling of 1200212100 in words is "one billion, two hundred million, two hundred twelve thousand, one hundred".