21663536224432 has 20 divisors (see below), whose sum is σ = 41975441759160. Its totient is φ = 10831164157568.

The previous prime is 21663536224411. The next prime is 21663536224441. The reversal of 21663536224432 is 23442263536612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37451173 + ... + 38025220.

It is an arithmetic number, because the mean of its divisors is an integer number (2098772087958).

Almost surely, 2^{21663536224432} is an apocalyptic number.

It is an amenable number.

21663536224432 is a deficient number, since it is larger than the sum of its proper divisors (20311905534728).

21663536224432 is a wasteful number, since it uses less digits than its factorization.

21663536224432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75494340 (or 75494334 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 49.

The spelling of 21663536224432 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred thirty-six million, two hundred twenty-four thousand, four hundred thirty-two".