21423344313 has 32 divisors (see below), whose sum is σ = 34520113152. Its totient is φ = 11558044800.

The previous prime is 21423344309. The next prime is 21423344347. The reversal of 21423344313 is 31344332412.

It is a happy number.

It is not a de Polignac number, because 21423344313 - 2² = 21423344309 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423344363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 374631 + ... + 428012.

It is an arithmetic number, because the mean of its divisors is an integer number (1078753536).

Almost surely, 2^21423344313 is an apocalyptic number.

It is an amenable number.

21423344313 is a deficient number, since it is larger than the sum of its proper divisors (13096768839).

21423344313 is a wasteful number, since it uses less digits than its factorization.

21423344313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802725.

The product of its digits is 20736, while the sum is 30.

Adding to 21423344313 its reverse (31344332412), we get a palindrome (52767676725).

The spelling of 21423344313 in words is "twenty-one billion, four hundred twenty-three million, three hundred forty-four thousand, three hundred thirteen".