21663524040524 has 24 divisors (see below), whose sum is σ = 39729261892320. Its totient is φ = 10316348814464.

The previous prime is 21663524040497. The next prime is 21663524040533. The reversal of 21663524040524 is 42504042536612.

It is a happy number.

It is a super-2 number, since 2×21663524040524² (a number of 27 digits) contains 22 as substring.

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, 505285619 + ... + 505328490.

It is an arithmetic number, because the mean of its divisors is an integer number (1655385912180).

Almost surely, 2^{21663524040524} is an apocalyptic number.

It is an amenable number.

21663524040524 is a deficient number, since it is larger than the sum of its proper divisors (18065737851796).

21663524040524 is a wasteful number, since it uses less digits than its factorization.

21663524040524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010614369 (or 1010614367 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 21663524040524 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred twenty-four million, forty thousand, five hundred twenty-four".