21011330344 has 8 divisors (see below), whose sum is σ = 39396244410. Its totient is φ = 10505665168.

The previous prime is 21011330317. The next prime is 21011330359. The reversal of 21011330344 is 44303311012.

It can be written as a sum of positive squares in only one way, i.e., 15893644900 + 5117685444 = 126070^2 + 71538^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1313208139 + ... + 1313208154.

Almost surely, 2^21011330344 is an apocalyptic number.

It is an amenable number.

21011330344 is a deficient number, since it is larger than the sum of its proper divisors (18384914066).

21011330344 is a wasteful number, since it uses less digits than its factorization.

21011330344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2626416299 (or 2626416295 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21011330344 its reverse (44303311012), we get a palindrome (65314641356).

The spelling of 21011330344 in words is "twenty-one billion, eleven million, three hundred thirty thousand, three hundred forty-four".