16621435135 has 4 divisors (see below), whose sum is σ = 19945722168. Its totient is φ = 13297148104.

The previous prime is 16621435091. The next prime is 16621435153. The reversal of 16621435135 is 53153412661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16621435135 - 2²⁷ = 16487217407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16621435094 and 16621435103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1662143509 + ... + 1662143518.

It is an arithmetic number, because the mean of its divisors is an integer number (4986430542).

Almost surely, 2^16621435135 is an apocalyptic number.

16621435135 is a deficient number, since it is larger than the sum of its proper divisors (3324287033).

16621435135 is an equidigital number, since it uses as much as digits as its factorization.

16621435135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324287032.

The product of its digits is 64800, while the sum is 37.

Adding to 16621435135 its reverse (53153412661), we get a palindrome (69774847796).

The spelling of 16621435135 in words is "sixteen billion, six hundred twenty-one million, four hundred thirty-five thousand, one hundred thirty-five".