1201121121021 has 8 divisors (see below), whose sum is σ = 1617043321920. Its totient is φ = 792973167072.

The previous prime is 1201121120951. The next prime is 1201121121029. The reversal of 1201121121021 is 1201211211021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1201121121021 - 2⁷ = 1201121120893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201121121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943561376 + ... + 1943561993.

It is an arithmetic number, because the mean of its divisors is an integer number (202130415240).

Almost surely, 2^{1201121121021} is an apocalyptic number.

It is an amenable number.

1201121121021 is a deficient number, since it is larger than the sum of its proper divisors (415922200899).

1201121121021 is a wasteful number, since it uses less digits than its factorization.

1201121121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887123475.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1201121121021 its reverse (1201211211021), we get a palindrome (2402332332042).

The spelling of 1201121121021 in words is "one trillion, two hundred one billion, one hundred twenty-one million, one hundred twenty-one thousand, twenty-one".