21340105445505 has 32 divisors (see below), whose sum is σ = 42569353202688. Its totient is φ = 8868615249600.

The previous prime is 21340105445429. The next prime is 21340105445543. The reversal of 21340105445505 is 50554450104312.

It is not a de Polignac number, because 21340105445505 - 2¹⁰ = 21340105444481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9238139731 + ... + 9238142040.

It is an arithmetic number, because the mean of its divisors is an integer number (1330292287584).

Almost surely, 2^{21340105445505} is an apocalyptic number.

It is an amenable number.

21340105445505 is a deficient number, since it is larger than the sum of its proper divisors (21229247757183).

21340105445505 is a wasteful number, since it uses less digits than its factorization.

21340105445505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18476281797.

The product of its (nonzero) digits is 240000, while the sum is 39.

Adding to 21340105445505 its reverse (50554450104312), we get a palindrome (71894555549817).

The spelling of 21340105445505 in words is "twenty-one trillion, three hundred forty billion, one hundred five million, four hundred forty-five thousand, five hundred five".