641442021 has 16 divisors (see below), whose sum is σ = 945791040. Its totient is φ = 383425920.

The previous prime is 641442017. The next prime is 641442029. The reversal of 641442021 is 120244146.

It is a happy number.

641442021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 641442021 - 2² = 641442017 is a prime.

It is a super-2 number, since 2×641442021² = 822895732609128882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641441982 and 641442000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641442029) 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, 130726 + ... + 135543.

It is an arithmetic number, because the mean of its divisors is an integer number (59111940).

Almost surely, 2^641442021 is an apocalyptic number.

It is an amenable number.

641442021 is a deficient number, since it is larger than the sum of its proper divisors (304349019).

641442021 is a wasteful number, since it uses less digits than its factorization.

641442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266356.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 641442021 is about 25326.7056878703. The cubic root of 641442021 is about 862.4206280247.

Adding to 641442021 its reverse (120244146), we get a palindrome (761686167).

The spelling of 641442021 in words is "six hundred forty-one million, four hundred forty-two thousand, twenty-one".