122120666521 has 4 divisors (see below), whose sum is σ = 139566476032. Its totient is φ = 104674857012.

The previous prime is 122120666513. The next prime is 122120666527. The reversal of 122120666521 is 125666021221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122120666521 - 2³ = 122120666513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122120666527) 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, 8722904745 + ... + 8722904758.

It is an arithmetic number, because the mean of its divisors is an integer number (34891619008).

Almost surely, 2^122120666521 is an apocalyptic number.

It is an amenable number.

122120666521 is a deficient number, since it is larger than the sum of its proper divisors (17445809511).

122120666521 is an equidigital number, since it uses as much as digits as its factorization.

122120666521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17445809510.

The product of its (nonzero) digits is 17280, while the sum is 34.

Adding to 122120666521 its reverse (125666021221), we get a palindrome (247786687742).

The spelling of 122120666521 in words is "one hundred twenty-two billion, one hundred twenty million, six hundred sixty-six thousand, five hundred twenty-one".