2001121276 has 96 divisors (see below), whose sum is σ = 4517420544. Its totient is φ = 753024000.

The previous prime is 2001121261. The next prime is 2001121313. The reversal of 2001121276 is 6721211002.

It is a happy number.

It is a super-2 number, since 2×2001121276² = 8008972722519736352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1350456 + ... + 1351936.

It is an arithmetic number, because the mean of its divisors is an integer number (47056464).

Almost surely, 2^2001121276 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 2001121276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2258710272).

2001121276 is an abundant number, since it is smaller than the sum of its proper divisors (2516299268).

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

2001121276 is a wasteful number, since it uses less digits than its factorization.

2001121276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 2001121276 is about 44733.8940402018. The cubic root of 2001121276 is about 1260.1564591131.

Adding to 2001121276 its reverse (6721211002), we get a palindrome (8722332278).

The spelling of 2001121276 in words is "two billion, one million, one hundred twenty-one thousand, two hundred seventy-six".