16421634620404 has 24 divisors (see below), whose sum is σ = 30951759608168. Its totient is φ = 7578409196160.

The previous prime is 16421634620393. The next prime is 16421634620431. The reversal of 16421634620404 is 40402643612461.

It can be written as a sum of positive squares in 4 ways, for example, as 418284304 + 16421216336100 = 20452^2 + 4052310^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16314627 + ... + 17291914.

Almost surely, 2^{16421634620404} is an apocalyptic number.

It is an amenable number.

16421634620404 is a deficient number, since it is larger than the sum of its proper divisors (14530124987764).

16421634620404 is a wasteful number, since it uses less digits than its factorization.

16421634620404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33615955 (or 33615953 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 16421634620404 in words is "sixteen trillion, four hundred twenty-one billion, six hundred thirty-four million, six hundred twenty thousand, four hundred four".