21436563231632 has 20 divisors (see below), whose sum is σ = 41705678784396. Its totient is φ = 10673807416320.

The previous prime is 21436563231593. The next prime is 21436563231637. The reversal of 21436563231632 is 23613236563412.

It can be written as a sum of positive squares in 2 ways, for example, as 13481704001536 + 7954859230096 = 3671744^2 + 2820436^2 .

It is not an unprimeable number, because it can be changed into a prime (21436563231637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2779633493 + ... + 2779641204.

Almost surely, 2^{21436563231632} is an apocalyptic number.

It is an amenable number.

21436563231632 is a deficient number, since it is larger than the sum of its proper divisors (20269115552764).

21436563231632 is a wasteful number, since it uses less digits than its factorization.

21436563231632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559274946 (or 5559274940 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 47.

The spelling of 21436563231632 in words is "twenty-one trillion, four hundred thirty-six billion, five hundred sixty-three million, two hundred thirty-one thousand, six hundred thirty-two".