1221666930 has 96 divisors (see below), whose sum is σ = 3471361920. Its totient is φ = 295626240.

The previous prime is 1221666923. The next prime is 1221666931. The reversal of 1221666930 is 396661221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1221666931) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 998299 + ... + 999521.

It is an arithmetic number, because the mean of its divisors is an integer number (36160020).

Almost surely, 2^1221666930 is an apocalyptic number.

1221666930 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 1221666930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1735680960).

1221666930 is an abundant number, since it is smaller than the sum of its proper divisors (2249694990).

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

1221666930 is a wasteful number, since it uses less digits than its factorization.

1221666930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256 (or 2253 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1221666930 is about 34952.3522813558. The cubic root of 1221666930 is about 1069.0161655738.

The spelling of 1221666930 in words is "one billion, two hundred twenty-one million, six hundred sixty-six thousand, nine hundred thirty".