21631204543 has 8 divisors (see below), whose sum is σ = 23296841568. Its totient is φ = 19965810144.

The previous prime is 21631204523. The next prime is 21631204547. The reversal of 21631204543 is 34540213612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21631204543 - 2⁹ = 21631204031 is a prime.

It is a super-2 number, since 2×21631204543² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21631204547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152205 + ... + 257737.

It is an arithmetic number, because the mean of its divisors is an integer number (2912105196).

Almost surely, 2^21631204543 is an apocalyptic number.

21631204543 is a deficient number, since it is larger than the sum of its proper divisors (1665637025).

21631204543 is a wasteful number, since it uses less digits than its factorization.

21631204543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121313.

The product of its (nonzero) digits is 17280, while the sum is 31.

The spelling of 21631204543 in words is "twenty-one billion, six hundred thirty-one million, two hundred four thousand, five hundred forty-three".