1200120121220 has 48 divisors (see below), whose sum is σ = 2534529650688. Its totient is φ = 477330695040.

The previous prime is 1200120121217. The next prime is 1200120121231. The reversal of 1200120121220 is 221210210021.

It is a junction number, because it is equal to n+sod(n) for n = 1200120121195 and 1200120121204.

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, 9037142 + ... + 9168978.

It is an arithmetic number, because the mean of its divisors is an integer number (52802701056).

Almost surely, 2^{1200120121220} is an apocalyptic number.

1200120121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1200120121220 is an abundant number, since it is smaller than the sum of its proper divisors (1334409529468).

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

1200120121220 is a wasteful number, since it uses less digits than its factorization.

1200120121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134420 (or 134418 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1200120121220 its reverse (221210210021), we get a palindrome (1421330331241).

The spelling of 1200120121220 in words is "one trillion, two hundred billion, one hundred twenty million, one hundred twenty-one thousand, two hundred twenty".