21344423211 has 32 divisors (see below), whose sum is σ = 33523660800. Its totient is φ = 13398397920.

The previous prime is 21344423189. The next prime is 21344423263. The reversal of 21344423211 is 11232444312.

21344423211 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 442 + 3 + 211 = 666.

It is not a de Polignac number, because 21344423211 - 2⁵ = 21344423179 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21344423011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 313641 + ... + 375578.

It is an arithmetic number, because the mean of its divisors is an integer number (1047614400).

Almost surely, 2^21344423211 is an apocalyptic number.

21344423211 is a deficient number, since it is larger than the sum of its proper divisors (12179237589).

21344423211 is a wasteful number, since it uses less digits than its factorization.

21344423211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689296 (or 689290 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21344423211 its reverse (11232444312), we get a palindrome (32576867523).

The spelling of 21344423211 in words is "twenty-one billion, three hundred forty-four million, four hundred twenty-three thousand, two hundred eleven".