21666042332234 has 16 divisors (see below), whose sum is σ = 35134122703200. Its totient is φ = 9985487503824.

The previous prime is 21666042332227. The next prime is 21666042332267. The reversal of 21666042332234 is 43223324066612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7704850064 + ... + 7704852875.

It is an arithmetic number, because the mean of its divisors is an integer number (2195882668950).

Almost surely, 2^{21666042332234} is an apocalyptic number.

21666042332234 is a deficient number, since it is larger than the sum of its proper divisors (13468080370966).

21666042332234 is a wasteful number, since it uses less digits than its factorization.

21666042332234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15409702997.

The product of its (nonzero) digits is 1492992, while the sum is 44.

Adding to 21666042332234 its reverse (43223324066612), we get a palindrome (64889366398846).

The spelling of 21666042332234 in words is "twenty-one trillion, six hundred sixty-six billion, forty-two million, three hundred thirty-two thousand, two hundred thirty-four".