643302604021 has 16 divisors (see below), whose sum is σ = 802157643648. Its totient is φ = 501200985600.

The previous prime is 643302604019. The next prime is 643302604027. The reversal of 643302604021 is 120406203346.

It is not a de Polignac number, because 643302604021 - 2¹ = 643302604019 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 (643302604027) 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, 85200 + ... + 1137481.

It is an arithmetic number, because the mean of its divisors is an integer number (50134852728).

Almost surely, 2^643302604021 is an apocalyptic number.

It is an amenable number.

643302604021 is a deficient number, since it is larger than the sum of its proper divisors (158855039627).

643302604021 is a wasteful number, since it uses less digits than its factorization.

643302604021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229532.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 643302604021 its reverse (120406203346), we get a palindrome (763708807367).

The spelling of 643302604021 in words is "six hundred forty-three billion, three hundred two million, six hundred four thousand, twenty-one".