121200001200 has 90 divisors (see below), whose sum is σ = 420597683324. Its totient is φ = 32319999360.

The previous prime is 121200001121. The next prime is 121200001211. The reversal of 121200001200 is 2100002121.

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (9).

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 17 ways as a sum of consecutive naturals, for example, 16829734 + ... + 16836933.

Almost surely, 2^121200001200 is an apocalyptic number.

121200001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200001200 is an abundant number, since it is smaller than the sum of its proper divisors (299397682124).

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

121200001200 is a wasteful number, since it uses less digits than its factorization.

121200001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33666691 (or 33666677 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 121200001200 its reverse (2100002121), we get a palindrome (123300003321).

The spelling of 121200001200 in words is "one hundred twenty-one billion, two hundred million, one thousand, two hundred".