21130030244 has 12 divisors (see below), whose sum is σ = 36979843824. Its totient is φ = 10564360584.

The previous prime is 21130030213. The next prime is 21130030247. The reversal of 21130030244 is 44203003112.

It is a super-2 number, since 2×21130030244² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21130030247) 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, 87014 + ... + 223229.

It is an arithmetic number, because the mean of its divisors is an integer number (3081653652).

Almost surely, 2^21130030244 is an apocalyptic number.

It is an amenable number.

21130030244 is a deficient number, since it is larger than the sum of its proper divisors (15849813580).

21130030244 is a wasteful number, since it uses less digits than its factorization.

21130030244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327274 (or 327272 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21130030244 its reverse (44203003112), we get a palindrome (65333033356).

The spelling of 21130030244 in words is "twenty-one billion, one hundred thirty million, thirty thousand, two hundred forty-four".