2001220992 has 160 divisors (see below), whose sum is σ = 5987104200. Its totient is φ = 663552000.

The previous prime is 2001220987. The next prime is 2001221039. The reversal of 2001220992 is 2990221002.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2601984 + ... + 2602752.

Almost surely, 2^2001220992 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 2001220992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2993552100).

2001220992 is an abundant number, since it is smaller than the sum of its proper divisors (3985883208).

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

2001220992 is an equidigital number, since it uses as much as digits as its factorization.

2001220992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1046 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 2001220992 is about 44735.0085727051. The cubic root of 2001220992 is about 1260.1773899908.

Adding to 2001220992 its reverse (2990221002), we get a palindrome (4991441994).

It can be divided in two parts, 20012209 and 92, that added together give a triangular number (20012301 = T₆₃₂₆).

The spelling of 2001220992 in words is "two billion, one million, two hundred twenty thousand, nine hundred ninety-two".