21322212434 has 4 divisors (see below), whose sum is σ = 31983318654. Its totient is φ = 10661106216.

The previous prime is 21322212349. The next prime is 21322212437. The reversal of 21322212434 is 43421222312.

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., 15591268225 + 5730944209 = 124865^2 + 75703^2 .

It is not an unprimeable number, because it can be changed into a prime (21322212437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330553107 + ... + 5330553110.

Almost surely, 2^21322212434 is an apocalyptic number.

21322212434 is a deficient number, since it is larger than the sum of its proper divisors (10661106220).

21322212434 is a wasteful number, since it uses less digits than its factorization.

21322212434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10661106219.

The product of its digits is 4608, while the sum is 26.

Adding to 21322212434 its reverse (43421222312), we get a palindrome (64743434746).

The spelling of 21322212434 in words is "twenty-one billion, three hundred twenty-two million, two hundred twelve thousand, four hundred thirty-four".