121212001200 has 120 divisors (see below), whose sum is σ = 389532139776. Its totient is φ = 32219168000.

The previous prime is 121212001199. The next prime is 121212001217. The reversal of 121212001200 is 2100212121.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210805 + ... + 535595.

Almost surely, 2^121212001200 is an apocalyptic number.

121212001200 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 121212001200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194766069888).

121212001200 is an abundant number, since it is smaller than the sum of its proper divisors (268320138576).

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

121212001200 is a wasteful number, since it uses less digits than its factorization.

121212001200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325123 (or 325112 counting only the distinct ones).

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

Adding to 121212001200 its reverse (2100212121), we get a palindrome (123312213321).

The spelling of 121212001200 in words is "one hundred twenty-one billion, two hundred twelve million, one thousand, two hundred".