121200203220 has 48 divisors (see below), whose sum is σ = 340585744128. Its totient is φ = 32203370880.

The previous prime is 121200203213. The next prime is 121200203231. The reversal of 121200203220 is 22302002121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121200203220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3629596 + ... + 3662835.

It is an arithmetic number, because the mean of its divisors is an integer number (7095536336).

Almost surely, 2^121200203220 is an apocalyptic number.

121200203220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200203220 is an abundant number, since it is smaller than the sum of its proper divisors (219385540908).

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

121200203220 is a wasteful number, since it uses less digits than its factorization.

121200203220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7292720 (or 7292718 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 121200203220 its reverse (22302002121), we get a palindrome (143502205341).

The spelling of 121200203220 in words is "one hundred twenty-one billion, two hundred million, two hundred three thousand, two hundred twenty".