21430043344 has 40 divisors (see below), whose sum is σ = 42591024000. Its totient is φ = 10439520000.

The previous prime is 21430043339. The next prime is 21430043363. The reversal of 21430043344 is 44334003412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 470907 + ... + 514405.

It is an arithmetic number, because the mean of its divisors is an integer number (1064775600).

Almost surely, 2^21430043344 is an apocalyptic number.

It is an amenable number.

21430043344 is a deficient number, since it is larger than the sum of its proper divisors (21160980656).

21430043344 is a wasteful number, since it uses less digits than its factorization.

21430043344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44299 (or 44293 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21430043344 its reverse (44334003412), we get a palindrome (65764046756).

The spelling of 21430043344 in words is "twenty-one billion, four hundred thirty million, forty-three thousand, three hundred forty-four".