21542341105 has 8 divisors (see below), whose sum is σ = 26214905664. Its totient is φ = 16991142000.

The previous prime is 21542341057. The next prime is 21542341133. The reversal of 21542341105 is 50114324512.

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

It is not a de Polignac number, because 21542341105 - 2⁹ = 21542340593 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30340971 + ... + 30341680.

It is an arithmetic number, because the mean of its divisors is an integer number (3276863208).

Almost surely, 2^21542341105 is an apocalyptic number.

It is an amenable number.

21542341105 is a deficient number, since it is larger than the sum of its proper divisors (4672564559).

21542341105 is an equidigital number, since it uses as much as digits as its factorization.

21542341105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60682727.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21542341105 its reverse (50114324512), we get a palindrome (71656665617).

The spelling of 21542341105 in words is "twenty-one billion, five hundred forty-two million, three hundred forty-one thousand, one hundred five".