21663411203320 has 32 divisors (see below), whose sum is σ = 48946619476800. Its totient is φ = 8629107722368.

The previous prime is 21663411203143. The next prime is 21663411203333. The reversal of 21663411203320 is 2330211436612.

It is a happy number.

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, 1133014039 + ... + 1133033158.

It is an arithmetic number, because the mean of its divisors is an integer number (1529581858650).

Almost surely, 2^{21663411203320} is an apocalyptic number.

21663411203320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21663411203320 is an abundant number, since it is smaller than the sum of its proper divisors (27283208273480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21663411203320 is a wasteful number, since it uses less digits than its factorization.

21663411203320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266047447 (or 2266047443 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 21663411203320 its reverse (2330211436612), we get a palindrome (23993622639932).

The spelling of 21663411203320 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, two hundred three thousand, three hundred twenty".