2216942821 has 2 divisors, whose sum is σ = 2216942822. Its totient is φ = 2216942820.

The previous prime is 2216942813. The next prime is 2216942879. The reversal of 2216942821 is 1282496122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1420913025 + 796029796 = 37695^2 + 28214^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216942821 - 2³ = 2216942813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2216948821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108471410 + 1108471411.

It is an arithmetic number, because the mean of its divisors is an integer number (1108471411).

Almost surely, 2^2216942821 is an apocalyptic number.

It is an amenable number.

2216942821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216942821 is an equidigital number, since it uses as much as digits as its factorization.

2216942821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 2216942821 is about 47084.4222753131. The cubic root of 2216942821 is about 1303.9216530911.

The spelling of 2216942821 in words is "two billion, two hundred sixteen million, nine hundred forty-two thousand, eight hundred twenty-one".