21243221310 has 16 divisors (see below), whose sum is σ = 50983731216. Its totient is φ = 5664859008.

The previous prime is 21243221297. The next prime is 21243221323. The reversal of 21243221310 is 1312234212.

It is an interprime number because it is at equal distance from previous prime (21243221297) and next prime (21243221323).

It is a super-2 number, since 2×21243221310² (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, 354053659 + ... + 354053718.

It is an arithmetic number, because the mean of its divisors is an integer number (3186483201).

Almost surely, 2^21243221310 is an apocalyptic number.

21243221310 is an abundant number, since it is smaller than the sum of its proper divisors (29740509906).

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

21243221310 is a wasteful number, since it uses less digits than its factorization.

21243221310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708107387.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21243221310 its reverse (1312234212), we get a palindrome (22555455522).

The spelling of 21243221310 in words is "twenty-one billion, two hundred forty-three million, two hundred twenty-one thousand, three hundred ten".