21530545332130 has 8 divisors (see below), whose sum is σ = 38754981597852. Its totient is φ = 8612218132848.

The previous prime is 21530545332119. The next prime is 21530545332133. The reversal of 21530545332130 is 3123354503512.

It can be written as a sum of positive squares in 2 ways, for example, as 21233323009369 + 297222322761 = 4607963^2 + 545181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21530545332130.

It is not an unprimeable number, because it can be changed into a prime (21530545332133) 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, 1076527266597 + ... + 1076527266616.

Almost surely, 2^{21530545332130} is an apocalyptic number.

21530545332130 is a deficient number, since it is larger than the sum of its proper divisors (17224436265722).

21530545332130 is a wasteful number, since it uses less digits than its factorization.

21530545332130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153054533220.

The product of its (nonzero) digits is 162000, while the sum is 37.

Adding to 21530545332130 its reverse (3123354503512), we get a palindrome (24653899835642).

The spelling of 21530545332130 in words is "twenty-one trillion, five hundred thirty billion, five hundred forty-five million, three hundred thirty-two thousand, one hundred thirty".