1212211100 has 18 divisors (see below), whose sum is σ = 2630498304. Its totient is φ = 484884400.

The previous prime is 1212211097. The next prime is 1212211103. The reversal of 1212211100 is 11122121.

It is an interprime number because it is at equal distance from previous prime (1212211097) and next prime (1212211103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6060956 + ... + 6061155.

Almost surely, 2^1212211100 is an apocalyptic number.

1212211100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212211100 is an abundant number, since it is smaller than the sum of its proper divisors (1418287204).

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

1212211100 is a wasteful number, since it uses less digits than its factorization.

1212211100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12122125 (or 12122118 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1212211100 is about 34816.8220835848. The cubic root of 1212211100 is about 1066.2509197927.

Adding to 1212211100 its reverse (11122121), we get a palindrome (1223333221).

The spelling of 1212211100 in words is "one billion, two hundred twelve million, two hundred eleven thousand, one hundred".