1321120944 has 120 divisors (see below), whose sum is σ = 4343753232. Its totient is φ = 369538560.

The previous prime is 1321120921. The next prime is 1321120973. The reversal of 1321120944 is 4490211231.

It is a happy number.

It is a super-2 number, since 2×1321120944² = 3490721097350902272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11487 + ... + 52670.

Almost surely, 2^1321120944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321120944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171876616).

1321120944 is an abundant number, since it is smaller than the sum of its proper divisors (3022632288).

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

1321120944 is a wasteful number, since it uses less digits than its factorization.

1321120944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64195 (or 64186 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 1321120944 is about 36347.2274596014. The cubic root of 1321120944 is about 1097.2717358137.

It can be divided in two parts, 1321 and 120944, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 1321120944 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, nine hundred forty-four".