21440242230 has 64 divisors (see below), whose sum is σ = 56649542400. Its totient is φ = 5149941120.

The previous prime is 21440242211. The next prime is 21440242247. The reversal of 21440242230 is 3224204412.

It is a self number, because there is not a number n which added to its sum of digits gives 21440242230.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262060 + ... + 333999.

It is an arithmetic number, because the mean of its divisors is an integer number (885149100).

Almost surely, 2^21440242230 is an apocalyptic number.

21440242230 is an abundant number, since it is smaller than the sum of its proper divisors (35209300170).

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

21440242230 is a wasteful number, since it uses less digits than its factorization.

21440242230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596189.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21440242230 its reverse (3224204412), we get a palindrome (24664446642).

The spelling of 21440242230 in words is "twenty-one billion, four hundred forty million, two hundred forty-two thousand, two hundred thirty".