201212243100 has 432 divisors, whose sum is σ = 752856501600. Its totient is φ = 45908121600.

The previous prime is 201212243033. The next prime is 201212243107. The reversal of 201212243100 is 1342212102.

It is a happy number.

201212243100 is a `hidden beast` number, since 20 + 1 + 212 + 2 + 431 + 0 + 0 = 666.

It is a super-2 number, since 2×201212243100² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201212243107) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5535786 + ... + 5572014.

Almost surely, 2^201212243100 is an apocalyptic number.

201212243100 is a gapful number since it is divisible by the number (20) 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 201212243100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (376428250800).

201212243100 is an abundant number, since it is smaller than the sum of its proper divisors (551644258500).

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

201212243100 is a wasteful number, since it uses less digits than its factorization.

201212243100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36291 (or 36267 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 201212243100 its reverse (1342212102), we get a palindrome (202554455202).

The spelling of 201212243100 in words is "two hundred one billion, two hundred twelve million, two hundred forty-three thousand, one hundred".