641335404421 has 16 divisors (see below), whose sum is σ = 660494507904. Its totient is φ = 622372814784.

The previous prime is 641335404419. The next prime is 641335404431. The reversal of 641335404421 is 124404533146.

It is a cyclic number.

It is not a de Polignac number, because 641335404421 - 2¹ = 641335404419 is a prime.

It is a super-2 number, since 2×641335404421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641335404431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15871375 + ... + 15911731.

It is an arithmetic number, because the mean of its divisors is an integer number (41280906744).

Almost surely, 2^641335404421 is an apocalyptic number.

It is an amenable number.

641335404421 is a deficient number, since it is larger than the sum of its proper divisors (19159103483).

641335404421 is a wasteful number, since it uses less digits than its factorization.

641335404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42780.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 641335404421 its reverse (124404533146), we get a palindrome (765739937567).

The spelling of 641335404421 in words is "six hundred forty-one billion, three hundred thirty-five million, four hundred four thousand, four hundred twenty-one".