1201120016021 has 2 divisors, whose sum is σ = 1201120016022. Its totient is φ = 1201120016020.

The previous prime is 1201120016017. The next prime is 1201120016059. The reversal of 1201120016021 is 1206100211021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1198501647121 + 2618368900 = 1094761^2 + 51170^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201120016021 - 2² = 1201120016017 is a prime.

It is a super-3 number, since 3×1201120016021³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201120016071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600560008010 + 600560008011.

It is an arithmetic number, because the mean of its divisors is an integer number (600560008011).

Almost surely, 2^{1201120016021} is an apocalyptic number.

It is an amenable number.

1201120016021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201120016021 is an equidigital number, since it uses as much as digits as its factorization.

1201120016021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1201120016021 its reverse (1206100211021), we get a palindrome (2407220227042).

The spelling of 1201120016021 in words is "one trillion, two hundred one billion, one hundred twenty million, sixteen thousand, twenty-one".