641620442121 has 8 divisors (see below), whose sum is σ = 856151494464. Its totient is φ = 427418175600.

The previous prime is 641620442117. The next prime is 641620442129. The reversal of 641620442121 is 121244026146.

641620442121 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 641620442121 - 2² = 641620442117 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641620442129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82191901 + ... + 82199706.

It is an arithmetic number, because the mean of its divisors is an integer number (107018936808).

Almost surely, 2^641620442121 is an apocalyptic number.

It is an amenable number.

641620442121 is a deficient number, since it is larger than the sum of its proper divisors (214531052343).

641620442121 is a wasteful number, since it uses less digits than its factorization.

641620442121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164392911.

The product of its (nonzero) digits is 18432, while the sum is 33.

Adding to 641620442121 its reverse (121244026146), we get a palindrome (762864468267).

The spelling of 641620442121 in words is "six hundred forty-one billion, six hundred twenty million, four hundred forty-two thousand, one hundred twenty-one".