1200220220121 has 16 divisors (see below), whose sum is σ = 1739499620544. Its totient is φ = 731694279744.

The previous prime is 1200220220117. The next prime is 1200220220201. The reversal of 1200220220121 is 1210220220021.

It is not a de Polignac number, because 1200220220121 - 2² = 1200220220117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1200220220121.

It is not an unprimeable number, because it can be changed into a prime (1200220224121) 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, 143803666 + ... + 143812011.

It is an arithmetic number, because the mean of its divisors is an integer number (108718726284).

Almost surely, 2^{1200220220121} is an apocalyptic number.

It is an amenable number.

1200220220121 is a deficient number, since it is larger than the sum of its proper divisors (539279400423).

1200220220121 is a wasteful number, since it uses less digits than its factorization.

1200220220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287615800.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 1200220220121 its reverse (1210220220021), we get a palindrome (2410440440142).

The spelling of 1200220220121 in words is "one trillion, two hundred billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".