21230211344 has 10 divisors (see below), whose sum is σ = 41133534510. Its totient is φ = 10615105664.

The previous prime is 21230211323. The next prime is 21230211347. The reversal of 21230211344 is 44311203212.

It can be written as a sum of positive squares in only one way, i.e., 21228490000 + 1721344 = 145700^2 + 1312^2 .

It is not an unprimeable number, because it can be changed into a prime (21230211347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663444089 + ... + 663444120.

It is an arithmetic number, because the mean of its divisors is an integer number (4113353451).

Almost surely, 2^21230211344 is an apocalyptic number.

It is an amenable number.

21230211344 is a deficient number, since it is larger than the sum of its proper divisors (19903323166).

21230211344 is a wasteful number, since it uses less digits than its factorization.

21230211344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326888217 (or 1326888211 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21230211344 its reverse (44311203212), we get a palindrome (65541414556).

The spelling of 21230211344 in words is "twenty-one billion, two hundred thirty million, two hundred eleven thousand, three hundred forty-four".