2180944821 has 16 divisors (see below), whose sum is σ = 3246059520. Its totient is φ = 1291044720.

The previous prime is 2180944817. The next prime is 2180944837. The reversal of 2180944821 is 1284490812.

It is not a de Polignac number, because 2180944821 - 2² = 2180944817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2180944821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180954821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 767061 + ... + 769898.

It is an arithmetic number, because the mean of its divisors is an integer number (202878720).

Almost surely, 2^2180944821 is an apocalyptic number.

It is an amenable number.

2180944821 is a deficient number, since it is larger than the sum of its proper divisors (1065114699).

2180944821 is a wasteful number, since it uses less digits than its factorization.

2180944821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537016.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 2180944821 is about 46700.5869449197. The cubic root of 2180944821 is about 1296.8255527098.

The spelling of 2180944821 in words is "two billion, one hundred eighty million, nine hundred forty-four thousand, eight hundred twenty-one".