2291721984 has 360 divisors, whose sum is σ = 7330683360. Its totient is φ = 710664192.

The previous prime is 2291721983. The next prime is 2291722003. The reversal of 2291721984 is 4891271922.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291721983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22249677 + ... + 22249779.

Almost surely, 2^2291721984 is an apocalyptic number.

2291721984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2291721984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3665341680).

2291721984 is an abundant number, since it is smaller than the sum of its proper divisors (5038961376).

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

2291721984 is a wasteful number, since it uses less digits than its factorization.

2291721984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 174 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 2291721984 is about 47871.9331550335. The cubic root of 2291721984 is about 1318.4205902933.

The spelling of 2291721984 in words is "two billion, two hundred ninety-one million, seven hundred twenty-one thousand, nine hundred eighty-four".