1212211200 has 168 divisors, whose sum is σ = 4010165208. Its totient is φ = 323092480.

The previous prime is 1212211199. The next prime is 1212211201. The reversal of 1212211200 is 21122121.

It is an interprime number because it is at equal distance from previous prime (1212211199) and next prime (1212211201).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212211201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 613414 + ... + 615386.

It is an arithmetic number, because the mean of its divisors is an integer number (23870031).

Almost surely, 2^1212211200 is an apocalyptic number.

1212211200 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 1212211200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2005082604).

1212211200 is an abundant number, since it is smaller than the sum of its proper divisors (2797954008).

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

1212211200 is an equidigital number, since it uses as much as digits as its factorization.

1212211200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012 (or 1983 counting only the distinct ones).

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

The square root of 1212211200 is about 34816.8235196722. The cubic root of 1212211200 is about 1066.2509491124.

Adding to 1212211200 its reverse (21122121), we get a palindrome (1233333321).

The spelling of 1212211200 in words is "one billion, two hundred twelve million, two hundred eleven thousand, two hundred".