16642042330121 has 4 divisors (see below), whose sum is σ = 17922199432452. Its totient is φ = 15361885227792.

The previous prime is 16642042330097. The next prime is 16642042330139. The reversal of 16642042330121 is 12103324024661.

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 2923826406400 + 13718215923721 = 1709920^2 + 3703811^2 .

It is a cyclic number.

It is not a de Polignac number, because 16642042330121 - 2⁶ = 16642042330057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16642042330181) 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, 640078551146 + ... + 640078551171.

It is an arithmetic number, because the mean of its divisors is an integer number (4480549858113).

Almost surely, 2^{16642042330121} is an apocalyptic number.

It is an amenable number.

16642042330121 is a deficient number, since it is larger than the sum of its proper divisors (1280157102331).

16642042330121 is a wasteful number, since it uses less digits than its factorization.

16642042330121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280157102330.

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 16642042330121 its reverse (12103324024661), we get a palindrome (28745366354782).

The spelling of 16642042330121 in words is "sixteen trillion, six hundred forty-two billion, forty-two million, three hundred thirty thousand, one hundred twenty-one".