21545341041 has 8 divisors (see below), whose sum is σ = 32830995904. Its totient is φ = 12311623440.

The previous prime is 21545341039. The next prime is 21545341067. The reversal of 21545341041 is 14014354512.

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

It is not a de Polignac number, because 21545341041 - 2¹ = 21545341039 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21545341021) 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, 512984290 + ... + 512984331.

It is an arithmetic number, because the mean of its divisors is an integer number (4103874488).

Almost surely, 2^21545341041 is an apocalyptic number.

21545341041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21545341041 is a deficient number, since it is larger than the sum of its proper divisors (11285654863).

21545341041 is a wasteful number, since it uses less digits than its factorization.

21545341041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025968631.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 21545341041 its reverse (14014354512), we get a palindrome (35559695553).

The spelling of 21545341041 in words is "twenty-one billion, five hundred forty-five million, three hundred forty-one thousand, forty-one".