1212401100 has 72 divisors (see below), whose sum is σ = 3530360848. Its totient is φ = 321235200.

The previous prime is 1212401081. The next prime is 1212401117. The reversal of 1212401100 is 11042121.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34230 + ... + 59970.

Almost surely, 2^1212401100 is an apocalyptic number.

1212401100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212401100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765180424).

1212401100 is an abundant number, since it is smaller than the sum of its proper divisors (2317959748).

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

1212401100 is a wasteful number, since it uses less digits than its factorization.

1212401100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25915 (or 25908 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212401100 is about 34819.5505427626. The cubic root of 1212401100 is about 1066.3066243619.

Adding to 1212401100 its reverse (11042121), we get a palindrome (1223443221).

The spelling of 1212401100 in words is "one billion, two hundred twelve million, four hundred one thousand, one hundred".