21226234436 has 24 divisors (see below), whose sum is σ = 40561093440. Its totient is φ = 9639173600.

The previous prime is 21226234433. The next prime is 21226234487. The reversal of 21226234436 is 63443262212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21226234396 and 21226234405.

It is not an unprimeable number, because it can be changed into a prime (21226234433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180656 + ... + 274023.

It is an arithmetic number, because the mean of its divisors is an integer number (1690045560).

Almost surely, 2^21226234436 is an apocalyptic number.

It is an amenable number.

21226234436 is a deficient number, since it is larger than the sum of its proper divisors (19334859004).

21226234436 is a wasteful number, since it uses less digits than its factorization.

21226234436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455755 (or 455753 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

Adding to 21226234436 its reverse (63443262212), we get a palindrome (84669496648).

The spelling of 21226234436 in words is "twenty-one billion, two hundred twenty-six million, two hundred thirty-four thousand, four hundred thirty-six".