21343402364 has 12 divisors (see below), whose sum is σ = 37566856824. Its totient is φ = 10610014704.

The previous prime is 21343402357. The next prime is 21343402387. The reversal of 21343402364 is 46320434312.

It is a self number, because there is not a number n which added to its sum of digits gives 21343402364.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15420842 + ... + 15422225.

It is an arithmetic number, because the mean of its divisors is an integer number (3130571402).

Almost surely, 2^21343402364 is an apocalyptic number.

It is an amenable number.

21343402364 is a deficient number, since it is larger than the sum of its proper divisors (16223454460).

21343402364 is a wasteful number, since it uses less digits than its factorization.

21343402364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30843244 (or 30843242 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 21343402364 its reverse (46320434312), we get a palindrome (67663836676).

The spelling of 21343402364 in words is "twenty-one billion, three hundred forty-three million, four hundred two thousand, three hundred sixty-four".