121200121210 has 32 divisors (see below), whose sum is σ = 255124248192. Its totient is φ = 40587946560.

The previous prime is 121200121157. The next prime is 121200121219. The reversal of 121200121210 is 12121002121.

It is not an unprimeable number, because it can be changed into a prime (121200121219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20129901 + ... + 20135920.

It is an arithmetic number, because the mean of its divisors is an integer number (7972632756).

Almost surely, 2^121200121210 is an apocalyptic number.

121200121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121200121210 is an abundant number, since it is smaller than the sum of its proper divisors (133924126982).

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

121200121210 is a wasteful number, since it uses less digits than its factorization.

121200121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40265878.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121200121210 its reverse (12121002121), we get a palindrome (133321123331).

The spelling of 121200121210 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, two hundred ten".