21540241043 has 8 divisors (see below), whose sum is σ = 22676214720. Its totient is φ = 20404495080.

The previous prime is 21540241039. The next prime is 21540241061. The reversal of 21540241043 is 34014204512.

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 21540241043 - 2² = 21540241039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21540241003) 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, 158108 + ... + 260918.

It is an arithmetic number, because the mean of its divisors is an integer number (2834526840).

Almost surely, 2^21540241043 is an apocalyptic number.

21540241043 is a deficient number, since it is larger than the sum of its proper divisors (1135973677).

21540241043 is a wasteful number, since it uses less digits than its factorization.

21540241043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113857.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 21540241043 its reverse (34014204512), we get a palindrome (55554445555).

The spelling of 21540241043 in words is "twenty-one billion, five hundred forty million, two hundred forty-one thousand, forty-three".