21223213234 has 4 divisors (see below), whose sum is σ = 31834819854. Its totient is φ = 10611606616.

The previous prime is 21223213189. The next prime is 21223213241. The reversal of 21223213234 is 43231232212.

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., 11620193209 + 9603020025 = 107797^2 + 97995^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21223213199 and 21223213208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305803307 + ... + 5305803310.

Almost surely, 2^21223213234 is an apocalyptic number.

21223213234 is a deficient number, since it is larger than the sum of its proper divisors (10611606620).

21223213234 is a wasteful number, since it uses less digits than its factorization.

21223213234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611606619.

The product of its digits is 3456, while the sum is 25.

Adding to 21223213234 its reverse (43231232212), we get a palindrome (64454445446).

The spelling of 21223213234 in words is "twenty-one billion, two hundred twenty-three million, two hundred thirteen thousand, two hundred thirty-four".