21226436213 has 8 divisors (see below), whose sum is σ = 22160736000. Its totient is φ = 20293087408.

The previous prime is 21226436197. The next prime is 21226436251. The reversal of 21226436213 is 31263462212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21226436213 - 2⁴ = 21226436197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21226436213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226436513) 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 in 7 ways as a sum of consecutive naturals, for example, 191933 + ... + 281586.

It is an arithmetic number, because the mean of its divisors is an integer number (2770092000).

Almost surely, 2^21226436213 is an apocalyptic number.

21226436213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21226436213 is a deficient number, since it is larger than the sum of its proper divisors (934299787).

21226436213 is a wasteful number, since it uses less digits than its factorization.

21226436213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475491.

The product of its digits is 20736, while the sum is 32.

Adding to 21226436213 its reverse (31263462212), we get a palindrome (52489898425).

The spelling of 21226436213 in words is "twenty-one billion, two hundred twenty-six million, four hundred thirty-six thousand, two hundred thirteen".