21344430213 has 12 divisors (see below), whose sum is σ = 30836253760. Its totient is φ = 14227123176.

The previous prime is 21344430203. The next prime is 21344430221. The reversal of 21344430213 is 31203444312.

21344430213 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 443 + 0 + 213 = 666.

It is not a de Polignac number, because 21344430213 - 2⁸ = 21344429957 is a prime.

It is a super-2 number, since 2×21344430213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344430203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153181 + ... + 257202.

Almost surely, 2^21344430213 is an apocalyptic number.

It is an amenable number.

21344430213 is a deficient number, since it is larger than the sum of its proper divisors (9491823547).

21344430213 is a wasteful number, since it uses less digits than its factorization.

21344430213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416168 (or 416165 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21344430213 its reverse (31203444312), we get a palindrome (52547874525).

The spelling of 21344430213 in words is "twenty-one billion, three hundred forty-four million, four hundred thirty thousand, two hundred thirteen".