639062410021 has 16 divisors (see below), whose sum is σ = 734485601664. Its totient is φ = 544674023424.

The previous prime is 639062410003. The next prime is 639062410031. The reversal of 639062410021 is 120014260936.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 639062410021 - 2⁹ = 639062409509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639062410001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2798850 + ... + 3018556.

It is an arithmetic number, because the mean of its divisors is an integer number (45905350104).

Almost surely, 2^639062410021 is an apocalyptic number.

It is an amenable number.

639062410021 is a deficient number, since it is larger than the sum of its proper divisors (95423191643).

639062410021 is a wasteful number, since it uses less digits than its factorization.

639062410021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222060.

The product of its (nonzero) digits is 15552, while the sum is 34.

Adding to 639062410021 its reverse (120014260936), we get a palindrome (759076670957).

The spelling of 639062410021 in words is "six hundred thirty-nine billion, sixty-two million, four hundred ten thousand, twenty-one".