21161162355 has 16 divisors (see below), whose sum is σ = 33866065824. Its totient is φ = 11283217920.

The previous prime is 21161162333. The next prime is 21161162357. The reversal of 21161162355 is 55326116112.

It is not a de Polignac number, because 21161162355 - 2⁶ = 21161162291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21161162357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106216 + ... + 231525.

It is an arithmetic number, because the mean of its divisors is an integer number (2116629114).

Almost surely, 2^21161162355 is an apocalyptic number.

21161162355 is a deficient number, since it is larger than the sum of its proper divisors (12704903469).

21161162355 is a wasteful number, since it uses less digits than its factorization.

21161162355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341926.

The product of its digits is 10800, while the sum is 33.

Adding to 21161162355 its reverse (55326116112), we get a palindrome (76487278467).

The spelling of 21161162355 in words is "twenty-one billion, one hundred sixty-one million, one hundred sixty-two thousand, three hundred fifty-five".