21434340344 has 24 divisors (see below), whose sum is σ = 42415952760. Its totient is φ = 10153107216.

The previous prime is 21434340337. The next prime is 21434340353. The reversal of 21434340344 is 44304343412.

It is a self number, because there is not a number n which added to its sum of digits gives 21434340344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3708044 + ... + 3713819.

It is an arithmetic number, because the mean of its divisors is an integer number (1767331365).

Almost surely, 2^21434340344 is an apocalyptic number.

It is an amenable number.

21434340344 is a deficient number, since it is larger than the sum of its proper divisors (20981612416).

21434340344 is a wasteful number, since it uses less digits than its factorization.

21434340344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7421907 (or 7421884 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21434340344 its reverse (44304343412), we get a palindrome (65738683756).

The spelling of 21434340344 in words is "twenty-one billion, four hundred thirty-four million, three hundred forty thousand, three hundred forty-four".