2001134821 has 32 divisors (see below), whose sum is σ = 2512270080. Its totient is φ = 1554201600.

The previous prime is 2001134819. The next prime is 2001134827. The reversal of 2001134821 is 1284311002.

It is a happy number.

It is not a de Polignac number, because 2001134821 - 2¹ = 2001134819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001134792 and 2001134801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001134827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1693851 + ... + 1695031.

It is an arithmetic number, because the mean of its divisors is an integer number (78508440).

Almost surely, 2^2001134821 is an apocalyptic number.

It is an amenable number.

2001134821 is a deficient number, since it is larger than the sum of its proper divisors (511135259).

2001134821 is a wasteful number, since it uses less digits than its factorization.

2001134821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 2001134821 is about 44734.0454352163. The cubic root of 2001134821 is about 1260.1593023159.

Adding to 2001134821 its reverse (1284311002), we get a palindrome (3285445823).

The spelling of 2001134821 in words is "two billion, one million, one hundred thirty-four thousand, eight hundred twenty-one".