21440244310 has 16 divisors (see below), whose sum is σ = 38594702736. Its totient is φ = 8575594848.

The previous prime is 21440244307. The next prime is 21440244341. The reversal of 21440244310 is 1344204412.

It is a super-2 number, since 2×21440244310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150784 + ... + 256156.

It is an arithmetic number, because the mean of its divisors is an integer number (2412168921).

Almost surely, 2^21440244310 is an apocalyptic number.

21440244310 is a deficient number, since it is larger than the sum of its proper divisors (17154458426).

21440244310 is a wasteful number, since it uses less digits than its factorization.

21440244310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125727.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21440244310 its reverse (1344204412), we get a palindrome (22784448722).

The spelling of 21440244310 in words is "twenty-one billion, four hundred forty million, two hundred forty-four thousand, three hundred ten".