2216188421 has 2 divisors, whose sum is σ = 2216188422. Its totient is φ = 2216188420.

The previous prime is 2216188417. The next prime is 2216188441. The reversal of 2216188421 is 1248816122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1962933025 + 253255396 = 44305^2 + 15914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216188421 - 2² = 2216188417 is a prime.

It is a super-2 number, since 2×2216188421² = 9822982234748946482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2216188441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108094210 + 1108094211.

It is an arithmetic number, because the mean of its divisors is an integer number (1108094211).

Almost surely, 2^2216188421 is an apocalyptic number.

It is an amenable number.

2216188421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216188421 is an equidigital number, since it uses as much as digits as its factorization.

2216188421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 35.

The square root of 2216188421 is about 47076.4104515202. The cubic root of 2216188421 is about 1303.7737331591.

The spelling of 2216188421 in words is "two billion, two hundred sixteen million, one hundred eighty-eight thousand, four hundred twenty-one".