21166234233351 has 8 divisors (see below), whose sum is σ = 28223801172720. Its totient is φ = 14109745058112.

The previous prime is 21166234233341. The next prime is 21166234233367. The reversal of 21166234233351 is 15333243266112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21166234233351 - 2¹³ = 21166234225159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166234233341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269395206 + ... + 269473763.

It is an arithmetic number, because the mean of its divisors is an integer number (3527975146590).

Almost surely, 2^{21166234233351} is an apocalyptic number.

21166234233351 is a deficient number, since it is larger than the sum of its proper divisors (7057566939369).

21166234233351 is a wasteful number, since it uses less digits than its factorization.

21166234233351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538882065.

The product of its digits is 466560, while the sum is 42.

Adding to 21166234233351 its reverse (15333243266112), we get a palindrome (36499477499463).

The spelling of 21166234233351 in words is "twenty-one trillion, one hundred sixty-six billion, two hundred thirty-four million, two hundred thirty-three thousand, three hundred fifty-one".