21530602224164 has 12 divisors (see below), whose sum is σ = 41103876973488. Its totient is φ = 9786637374600.

The previous prime is 21530602224143. The next prime is 21530602224167. The reversal of 21530602224164 is 46142220603512.

It is not an unprimeable number, because it can be changed into a prime (21530602224167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244665934322 + ... + 244665934409.

It is an arithmetic number, because the mean of its divisors is an integer number (3425323081124).

Almost surely, 2^{21530602224164} is an apocalyptic number.

It is an amenable number.

21530602224164 is a deficient number, since it is larger than the sum of its proper divisors (19573274749324).

21530602224164 is a wasteful number, since it uses less digits than its factorization.

21530602224164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489331868746 (or 489331868744 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21530602224164 its reverse (46142220603512), we get a palindrome (67672822827676).

The spelling of 21530602224164 in words is "twenty-one trillion, five hundred thirty billion, six hundred two million, two hundred twenty-four thousand, one hundred sixty-four".