21023201344 has 14 divisors (see below), whose sum is σ = 41717915294. Its totient is φ = 10511600640.

The previous prime is 21023201341. The next prime is 21023201393. The reversal of 21023201344 is 44310232012.

It can be written as a sum of positive squares in only one way, i.e., 20886030400 + 137170944 = 144520^2 + 11712^2 .

It is not an unprimeable number, because it can be changed into a prime (21023201341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164243697 + ... + 164243824.

Almost surely, 2^21023201344 is an apocalyptic number.

It is an amenable number.

21023201344 is a deficient number, since it is larger than the sum of its proper divisors (20694713950).

21023201344 is an equidigital number, since it uses as much as digits as its factorization.

21023201344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328487533 (or 328487523 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21023201344 its reverse (44310232012), we get a palindrome (65333433356).

The spelling of 21023201344 in words is "twenty-one billion, twenty-three million, two hundred one thousand, three hundred forty-four".