21123332222 has 4 divisors (see below), whose sum is σ = 31684998336. Its totient is φ = 10561666110.

The previous prime is 21123332221. The next prime is 21123332231. The reversal of 21123332222 is 22223332112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123332221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280833054 + ... + 5280833057.

It is an arithmetic number, because the mean of its divisors is an integer number (7921249584).

Almost surely, 2^21123332222 is an apocalyptic number.

21123332222 is a deficient number, since it is larger than the sum of its proper divisors (10561666114).

21123332222 is a wasteful number, since it uses less digits than its factorization.

21123332222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561666113.

The product of its digits is 1728, while the sum is 23.

Adding to 21123332222 its reverse (22223332112), we get a palindrome (43346664334).

The spelling of 21123332222 in words is "twenty-one billion, one hundred twenty-three million, three hundred thirty-two thousand, two hundred twenty-two".