21164545543 has 8 divisors (see below), whose sum is σ = 21526006176. Its totient is φ = 20803552800.

The previous prime is 21164545499. The next prime is 21164545547. The reversal of 21164545543 is 34554546112.

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 21164545543 - 2²⁹ = 20627674631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21164545496 and 21164545505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21164545547) 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, 25123 + ... + 207268.

It is an arithmetic number, because the mean of its divisors is an integer number (2690750772).

Almost surely, 2^21164545543 is an apocalyptic number.

21164545543 is a deficient number, since it is larger than the sum of its proper divisors (361460633).

21164545543 is a wasteful number, since it uses less digits than its factorization.

21164545543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233945.

The product of its digits is 288000, while the sum is 40.

The spelling of 21164545543 in words is "twenty-one billion, one hundred sixty-four million, five hundred forty-five thousand, five hundred forty-three".