21324610244216 has 8 divisors (see below), whose sum is σ = 39983644207920. Its totient is φ = 10662305122104.

The previous prime is 21324610244173. The next prime is 21324610244237. The reversal of 21324610244216 is 61244201642312.

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

It is a super-2 number, since 2×21324610244216² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21324610244216.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332788140256 + ... + 1332788140271.

It is an arithmetic number, because the mean of its divisors is an integer number (4997955525990).

Almost surely, 2^{21324610244216} is an apocalyptic number.

It is an amenable number.

21324610244216 is a deficient number, since it is larger than the sum of its proper divisors (18659033963704).

21324610244216 is a wasteful number, since it uses less digits than its factorization.

21324610244216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665576280533 (or 2665576280529 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

Adding to 21324610244216 its reverse (61244201642312), we get a palindrome (82568811886528).

The spelling of 21324610244216 in words is "twenty-one trillion, three hundred twenty-four billion, six hundred ten million, two hundred forty-four thousand, two hundred sixteen".