21530244203512 has 16 divisors (see below), whose sum is σ = 44039135871000. Its totient is φ = 9786474637920.

The previous prime is 21530244203437. The next prime is 21530244203527.

21530244203512 is nontrivially palindromic in base 10.

It is a congruent number.

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, 122330932887 + ... + 122330933062.

Almost surely, 2^{21530244203512} is an apocalyptic number.

21530244203512 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21530244203512 is an abundant number, since it is smaller than the sum of its proper divisors (22508891667488).

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

21530244203512 is a wasteful number, since it uses less digits than its factorization.

21530244203512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244661865966 (or 244661865962 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

It can be divided in two parts, 2153024 and 4203512, that added together give a palindrome (6356536).

The spelling of 21530244203512 in words is "twenty-one trillion, five hundred thirty billion, two hundred forty-four million, two hundred three thousand, five hundred twelve".