1211200100 has 36 divisors (see below), whose sum is σ = 2867243568. Its totient is φ = 440436000.

The previous prime is 1211200091. The next prime is 1211200117. The reversal of 1211200100 is 10021121.

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, 549446 + ... + 551645.

Almost surely, 2^1211200100 is an apocalyptic number.

1211200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211200100 is an abundant number, since it is smaller than the sum of its proper divisors (1656043468).

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

1211200100 is a wasteful number, since it uses less digits than its factorization.

1211200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101116 (or 1101109 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1211200100 is about 34802.3002113366. The cubic root of 1211200100 is about 1065.9544149177.

Adding to 1211200100 its reverse (10021121), we get a palindrome (1221221221).

The spelling of 1211200100 in words is "one billion, two hundred eleven million, two hundred thousand, one hundred".