123221310 has 64 divisors (see below), whose sum is σ = 304072704. Its totient is φ = 31942400.

The previous prime is 123221297. The next prime is 123221341. The reversal of 123221310 is 13122321.

It is a super-2 number, since 2×123221310² = 30366982476232200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 123221310.

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, 396055 + ... + 396365.

It is an arithmetic number, because the mean of its divisors is an integer number (4751136).

Almost surely, 2^123221310 is an apocalyptic number.

123221310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123221310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152036352).

123221310 is an abundant number, since it is smaller than the sum of its proper divisors (180851394).

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

123221310 is a wasteful number, since it uses less digits than its factorization.

123221310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123221310 is about 11100.5094477686. The cubic root of 123221310 is about 497.6170747088.

Adding to 123221310 its reverse (13122321), we get a palindrome (136343631).

The spelling of 123221310 in words is "one hundred twenty-three million, two hundred twenty-one thousand, three hundred ten".