21233123122 has 4 divisors (see below), whose sum is σ = 31849684686. Its totient is φ = 10616561560.

The previous prime is 21233123101. The next prime is 21233123129. The reversal of 21233123122 is 22132133212.

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

It can be written as a sum of positive squares in only one way, i.e., 13912438401 + 7320684721 = 117951^2 + 85561^2 .

It is a super-2 number, since 2×21233123122² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21233123093 and 21233123102.

It is not an unprimeable number, because it can be changed into a prime (21233123129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5308280779 + ... + 5308280782.

Almost surely, 2^21233123122 is an apocalyptic number.

21233123122 is a deficient number, since it is larger than the sum of its proper divisors (10616561564).

21233123122 is a wasteful number, since it uses less digits than its factorization.

21233123122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10616561563.

The product of its digits is 864, while the sum is 22.

Adding to 21233123122 its reverse (22132133212), we get a palindrome (43365256334).

The spelling of 21233123122 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-three thousand, one hundred twenty-two".