2000949821 has 4 divisors (see below), whose sum is σ = 2154869052. Its totient is φ = 1847030592.

The previous prime is 2000949817. The next prime is 2000949893. The reversal of 2000949821 is 1289490002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1289490002 = 2 ⋅644745001.

It can be written as a sum of positive squares in 2 ways, for example, as 728244196 + 1272705625 = 26986^2 + 35675^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000949821 - 2² = 2000949817 is a prime.

It is a super-3 number, since 3×2000949821³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000909821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76959596 + ... + 76959621.

It is an arithmetic number, because the mean of its divisors is an integer number (538717263).

Almost surely, 2^2000949821 is an apocalyptic number.

It is an amenable number.

2000949821 is a deficient number, since it is larger than the sum of its proper divisors (153919231).

2000949821 is a wasteful number, since it uses less digits than its factorization.

2000949821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153919230.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 2000949821 is about 44731.9776111005. The cubic root of 2000949821 is about 1260.1204682415.

The spelling of 2000949821 in words is "two billion, nine hundred forty-nine thousand, eight hundred twenty-one".