2781220221872 has 20 divisors (see below), whose sum is σ = 5388710658480. Its totient is φ = 1390585213248.

The previous prime is 2781220221847. The next prime is 2781220221893.

2781220221872 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617372 + ... + 2437947.

It is an arithmetic number, because the mean of its divisors is an integer number (269435532924).

Almost surely, 2^{2781220221872} is an apocalyptic number.

It is an amenable number.

2781220221872 is a deficient number, since it is larger than the sum of its proper divisors (2607490436608).

2781220221872 is a wasteful number, since it uses less digits than its factorization.

2781220221872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3112220 (or 3112214 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The spelling of 2781220221872 in words is "two trillion, seven hundred eighty-one billion, two hundred twenty million, two hundred twenty-one thousand, eight hundred seventy-two".