21663620663324 has 6 divisors (see below), whose sum is σ = 37911336160824. Its totient is φ = 10831810331660.

The previous prime is 21663620663323. The next prime is 21663620663329. The reversal of 21663620663324 is 42336602636612.

It is a happy number.

It is a super-3 number, since 3×21663620663324³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663620663323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2707952582912 + ... + 2707952582919.

It is an arithmetic number, because the mean of its divisors is an integer number (6318556026804).

Almost surely, 2^{21663620663324} is an apocalyptic number.

It is an amenable number.

21663620663324 is a deficient number, since it is larger than the sum of its proper divisors (16247715497500).

21663620663324 is a wasteful number, since it uses less digits than its factorization.

21663620663324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5415905165835 (or 5415905165833 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 50.

The spelling of 21663620663324 in words is "twenty-one trillion, six hundred sixty-three billion, six hundred twenty million, six hundred sixty-three thousand, three hundred twenty-four".