21130312230 has 48 divisors (see below), whose sum is σ = 56216468880. Its totient is φ = 5503708224.

The previous prime is 21130312211. The next prime is 21130312279. The reversal of 21130312230 is 3221303112.

21130312230 is a `hidden beast` number, since 211 + 303 + 122 + 30 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2726145 + ... + 2733884.

It is an arithmetic number, because the mean of its divisors is an integer number (1171176435).

Almost surely, 2^21130312230 is an apocalyptic number.

21130312230 is an abundant number, since it is smaller than the sum of its proper divisors (35086156650).

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

21130312230 is a wasteful number, since it uses less digits than its factorization.

21130312230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5460085 (or 5460082 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21130312230 its reverse (3221303112), we get a palindrome (24351615342).

The spelling of 21130312230 in words is "twenty-one billion, one hundred thirty million, three hundred twelve thousand, two hundred thirty".