21440343310 has 32 divisors (see below), whose sum is σ = 38840614560. Its totient is φ = 8521145472.

The previous prime is 21440343283. The next prime is 21440343347. The reversal of 21440343310 is 1334304412.

It is a super-2 number, since 2×21440343310² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1543476 + ... + 1557304.

It is an arithmetic number, because the mean of its divisors is an integer number (1213769205).

Almost surely, 2^21440343310 is an apocalyptic number.

21440343310 is a deficient number, since it is larger than the sum of its proper divisors (17400271250).

21440343310 is a wasteful number, since it uses less digits than its factorization.

21440343310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14820.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21440343310 its reverse (1334304412), we get a palindrome (22774647722).

The spelling of 21440343310 in words is "twenty-one billion, four hundred forty million, three hundred forty-three thousand, three hundred ten".