21361322169 has 12 divisors (see below), whose sum is σ = 33660265392. Its totient is φ = 12946255800.

The previous prime is 21361322159. The next prime is 21361322173. The reversal of 21361322169 is 96122316312.

21361322169 is a `hidden beast` number, since 2 + 1 + 3 + 613 + 22 + 16 + 9 = 666.

It is not a de Polignac number, because 21361322169 - 2⁷ = 21361322041 is a prime.

It is a super-2 number, since 2×21361322169² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21361322159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107885367 + ... + 107885564.

It is an arithmetic number, because the mean of its divisors is an integer number (2805022116).

Almost surely, 2^21361322169 is an apocalyptic number.

It is an amenable number.

21361322169 is a deficient number, since it is larger than the sum of its proper divisors (12298943223).

21361322169 is a wasteful number, since it uses less digits than its factorization.

21361322169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215770948 (or 215770945 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The spelling of 21361322169 in words is "twenty-one billion, three hundred sixty-one million, three hundred twenty-two thousand, one hundred sixty-nine".