2186736421 has 2 divisors, whose sum is σ = 2186736422. Its totient is φ = 2186736420.

The previous prime is 2186736397. The next prime is 2186736427. The reversal of 2186736421 is 1246376812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2163552196 + 23184225 = 46514^2 + 4815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2186736421 - 2¹⁷ = 2186605349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2186736427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093368210 + 1093368211.

It is an arithmetic number, because the mean of its divisors is an integer number (1093368211).

Almost surely, 2^2186736421 is an apocalyptic number.

It is an amenable number.

2186736421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2186736421 is an equidigital number, since it uses as much as digits as its factorization.

2186736421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 40.

The square root of 2186736421 is about 46762.5536193224. The cubic root of 2186736421 is about 1297.9724648580.

The spelling of 2186736421 in words is "two billion, one hundred eighty-six million, seven hundred thirty-six thousand, four hundred twenty-one".