21530545333420 has 12 divisors (see below), whose sum is σ = 45214145200224. Its totient is φ = 8612218133360.

The previous prime is 21530545333397. The next prime is 21530545333447. The reversal of 21530545333420 is 2433354503512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538263633316 + ... + 538263633355.

It is an arithmetic number, because the mean of its divisors is an integer number (3767845433352).

Almost surely, 2^{21530545333420} is an apocalyptic number.

21530545333420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21530545333420 is an abundant number, since it is smaller than the sum of its proper divisors (23683599866804).

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

21530545333420 is a wasteful number, since it uses less digits than its factorization.

21530545333420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076527266680 (or 1076527266678 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 40.

Adding to 21530545333420 its reverse (2433354503512), we get a palindrome (23963899836932).

The spelling of 21530545333420 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-five million, three hundred thirty-three thousand, four hundred twenty".