1601330112121 has 4 divisors (see below), whose sum is σ = 1601483257332. Its totient is φ = 1601176966912.

The previous prime is 1601330112037. The next prime is 1601330112131. The reversal of 1601330112121 is 1212110331061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 591877880896 + 1009452231225 = 769336^2 + 1004715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601330112121 is a prime.

It is a super-2 number, since 2×1601330112121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1601330112092 and 1601330112101.

It is not an unprimeable number, because it can be changed into a prime (1601330112131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76556920 + ... + 76577833.

It is an arithmetic number, because the mean of its divisors is an integer number (400370814333).

Almost surely, 2^{1601330112121} is an apocalyptic number.

It is an amenable number.

1601330112121 is a deficient number, since it is larger than the sum of its proper divisors (153145211).

1601330112121 is a wasteful number, since it uses less digits than its factorization.

1601330112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153145210.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 1601330112121 its reverse (1212110331061), we get a palindrome (2813440443182).

The spelling of 1601330112121 in words is "one trillion, six hundred one billion, three hundred thirty million, one hundred twelve thousand, one hundred twenty-one".