21455445132541 has 4 divisors (see below), whose sum is σ = 24520508722912. Its totient is φ = 18390381542172.

The previous prime is 21455445132521. The next prime is 21455445132551. The reversal of 21455445132541 is 14523154455412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21455445132541 - 2³⁵ = 21421085394173 is a prime.

It is a super-2 number, since 2×21455445132541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21455445132491 and 21455445132500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455445132521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1532531795175 + ... + 1532531795188.

It is an arithmetic number, because the mean of its divisors is an integer number (6130127180728).

Almost surely, 2^{21455445132541} is an apocalyptic number.

It is an amenable number.

21455445132541 is a deficient number, since it is larger than the sum of its proper divisors (3065063590371).

21455445132541 is an equidigital number, since it uses as much as digits as its factorization.

21455445132541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3065063590370.

The product of its digits is 1920000, while the sum is 46.

Adding to 21455445132541 its reverse (14523154455412), we get a palindrome (35978599587953).

The spelling of 21455445132541 in words is "twenty-one trillion, four hundred fifty-five billion, four hundred forty-five million, one hundred thirty-two thousand, five hundred forty-one".