21601200631543 has 96 divisors (see below), whose sum is σ = 26410901078016. Its totient is φ = 17497224999936.

The previous prime is 21601200631529. The next prime is 21601200631589. The reversal of 21601200631543 is 34513600210612.

It is not a de Polignac number, because 21601200631543 - 2⁴¹ = 19402177375991 is a prime.

It is a super-2 number, since 2×21601200631543² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21601200631499 and 21601200631508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601200631513) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1339435146 + ... + 1339451272.

It is an arithmetic number, because the mean of its divisors is an integer number (275113552896).

Almost surely, 2^{21601200631543} is an apocalyptic number.

21601200631543 is a deficient number, since it is larger than the sum of its proper divisors (4809700446473).

21601200631543 is a wasteful number, since it uses less digits than its factorization.

21601200631543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16461 (or 16442 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21601200631543 in words is "twenty-one trillion, six hundred one billion, two hundred million, six hundred thirty-one thousand, five hundred forty-three".