21040001344 has 28 divisors (see below), whose sum is σ = 42001281504. Its totient is φ = 10457001344.

The previous prime is 21040001327. The next prime is 21040001383. The reversal of 21040001344 is 44310004012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973594 + ... + 994969.

It is an arithmetic number, because the mean of its divisors is an integer number (1500045768).

Almost surely, 2^21040001344 is an apocalyptic number.

It is an amenable number.

21040001344 is a deficient number, since it is larger than the sum of its proper divisors (20961280160).

21040001344 is a wasteful number, since it uses less digits than its factorization.

21040001344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968742 (or 1968732 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21040001344 its reverse (44310004012), we get a palindrome (65350005356).

The spelling of 21040001344 in words is "twenty-one billion, forty million, one thousand, three hundred forty-four".