2993811821 has 32 divisors (see below), whose sum is σ = 4128354048. Its totient is φ = 2095165440.

The previous prime is 2993811811. The next prime is 2993811823. The reversal of 2993811821 is 1281183992.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2993811821 - 2⁶ = 2993811757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2993811823) 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, 3380 + ... + 77453.

It is an arithmetic number, because the mean of its divisors is an integer number (129011064).

Almost surely, 2^2993811821 is an apocalyptic number.

It is an amenable number.

2993811821 is a deficient number, since it is larger than the sum of its proper divisors (1134542227).

2993811821 is a wasteful number, since it uses less digits than its factorization.

2993811821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80901.

The product of its digits is 62208, while the sum is 44.

The square root of 2993811821 is about 54715.7365023994. The cubic root of 2993811821 is about 1441.2572322978.

The spelling of 2993811821 in words is "two billion, nine hundred ninety-three million, eight hundred eleven thousand, eight hundred twenty-one".