18420210135505 has 64 divisors (see below), whose sum is σ = 23058742809600. Its totient is φ = 14109024061440.

The previous prime is 18420210135469. The next prime is 18420210135527. The reversal of 18420210135505 is 50553101202481.

It is not a de Polignac number, because 18420210135505 - 2²³ = 18420201746897 is a prime.

It is a super-2 number, since 2×18420210135505² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13944140245 + ... + 13944141565.

It is an arithmetic number, because the mean of its divisors is an integer number (360292856400).

Almost surely, 2^{18420210135505} is an apocalyptic number.

It is an amenable number.

18420210135505 is a deficient number, since it is larger than the sum of its proper divisors (4638532674095).

18420210135505 is a wasteful number, since it uses less digits than its factorization.

18420210135505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2954.

The product of its (nonzero) digits is 48000, while the sum is 37.

Adding to 18420210135505 its reverse (50553101202481), we get a palindrome (68973311337986).

The spelling of 18420210135505 in words is "eighteen trillion, four hundred twenty billion, two hundred ten million, one hundred thirty-five thousand, five hundred five".