646310122121 has 4 divisors (see below), whose sum is σ = 646424579712. Its totient is φ = 646195664532.

The previous prime is 646310122063. The next prime is 646310122193. The reversal of 646310122121 is 121221013646.

646310122121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 646310122121 - 2¹⁴ = 646310105737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646310122321) 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, 57220325 + ... + 57231618.

It is an arithmetic number, because the mean of its divisors is an integer number (161606144928).

Almost surely, 2^646310122121 is an apocalyptic number.

It is an amenable number.

646310122121 is a deficient number, since it is larger than the sum of its proper divisors (114457591).

646310122121 is a wasteful number, since it uses less digits than its factorization.

646310122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114457590.

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 646310122121 its reverse (121221013646), we get a palindrome (767531135767).

The spelling of 646310122121 in words is "six hundred forty-six billion, three hundred ten million, one hundred twenty-two thousand, one hundred twenty-one".