1221322830 has 128 divisors (see below), whose sum is σ = 3658991616. Its totient is φ = 254016000.

The previous prime is 1221322799. The next prime is 1221322867. The reversal of 1221322830 is 382231221.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221322830.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 190680 + ... + 196980.

It is an arithmetic number, because the mean of its divisors is an integer number (28585872).

Almost surely, 2^1221322830 is an apocalyptic number.

1221322830 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 1221322830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1829495808).

1221322830 is an abundant number, since it is smaller than the sum of its proper divisors (2437668786).

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

1221322830 is a wasteful number, since it uses less digits than its factorization.

1221322830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1221322830 is about 34947.4295192078. The cubic root of 1221322830 is about 1068.9157882409.

The spelling of 1221322830 in words is "one billion, two hundred twenty-one million, three hundred twenty-two thousand, eight hundred thirty".