1201202021121 has 16 divisors (see below), whose sum is σ = 1657202146560. Its totient is φ = 773014014080.

The previous prime is 1201202021077. The next prime is 1201202021143. The reversal of 1201202021121 is 1211202021021.

It is a cyclic number.

It is not a de Polignac number, because 1201202021121 - 2⁹ = 1201202020609 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201202021121.

It is not an unprimeable number, because it can be changed into a prime (1201202021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158540 + ... + 1935101.

It is an arithmetic number, because the mean of its divisors is an integer number (103575134160).

Almost surely, 2^{1201202021121} is an apocalyptic number.

It is an amenable number.

1201202021121 is a deficient number, since it is larger than the sum of its proper divisors (456000125439).

1201202021121 is a wasteful number, since it uses less digits than its factorization.

1201202021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098136.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1201202021121 its reverse (1211202021021), we get a palindrome (2412404042142).

The spelling of 1201202021121 in words is "one trillion, two hundred one billion, two hundred two million, twenty-one thousand, one hundred twenty-one".