21543260145 has 16 divisors (see below), whose sum is σ = 37602781632. Its totient is φ = 10445216960.

The previous prime is 21543260083. The next prime is 21543260153. The reversal of 21543260145 is 54106234512.

It is not a de Polignac number, because 21543260145 - 2¹¹ = 21543258097 is a prime.

It is a super-2 number, since 2×21543260145² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65282442 + ... + 65282771.

It is an arithmetic number, because the mean of its divisors is an integer number (2350173852).

Almost surely, 2^21543260145 is an apocalyptic number.

It is an amenable number.

21543260145 is a deficient number, since it is larger than the sum of its proper divisors (16059521487).

21543260145 is a wasteful number, since it uses less digits than its factorization.

21543260145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130565232.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21543260145 its reverse (54106234512), we get a palindrome (75649494657).

The spelling of 21543260145 in words is "twenty-one billion, five hundred forty-three million, two hundred sixty thousand, one hundred forty-five".