1321209988 has 24 divisors (see below), whose sum is σ = 2649032064. Its totient is φ = 564816000.

The previous prime is 1321209971. The next prime is 1321210003. The reversal of 1321209988 is 8899021231.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47608 + ... + 70063.

It is an arithmetic number, because the mean of its divisors is an integer number (110376336).

Almost surely, 2^1321209988 is an apocalyptic number.

It is an amenable number.

1321209988 is an abundant number, since it is smaller than the sum of its proper divisors (1327822076).

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

1321209988 is a wasteful number, since it uses less digits than its factorization.

1321209988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118083 (or 118081 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 1321209988 is about 36348.4523466956. The cubic root of 1321209988 is about 1097.2963874223.

The spelling of 1321209988 in words is "one billion, three hundred twenty-one million, two hundred nine thousand, nine hundred eighty-eight".