2216591802981 has 48 divisors (see below), whose sum is σ = 3391981092864. Its totient is φ = 1445856504624.

The previous prime is 2216591802977. The next prime is 2216591803003. The reversal of 2216591802981 is 1892081956122.

2216591802981 is a `hidden beast` number, since 2 + 21 + 6 + 591 + 8 + 0 + 29 + 8 + 1 = 666.

It is not a de Polignac number, because 2216591802981 - 2² = 2216591802977 is a prime.

It is a super-2 number, since 2×2216591802981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216591802961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40894360 + ... + 40948526.

It is an arithmetic number, because the mean of its divisors is an integer number (70666272768).

Almost surely, 2^{2216591802981} is an apocalyptic number.

It is an amenable number.

2216591802981 is a deficient number, since it is larger than the sum of its proper divisors (1175389289883).

2216591802981 is an equidigital number, since it uses as much as digits as its factorization.

2216591802981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57812 (or 57800 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 2216591802981 in words is "two trillion, two hundred sixteen billion, five hundred ninety-one million, eight hundred two thousand, nine hundred eighty-one".