2166521351 has 2 divisors, whose sum is σ = 2166521352. Its totient is φ = 2166521350.

The previous prime is 2166521257. The next prime is 2166521381. The reversal of 2166521351 is 1531256612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2166521351 - 2¹⁰ = 2166520327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166521381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083260675 + 1083260676.

It is an arithmetic number, because the mean of its divisors is an integer number (1083260676).

Almost surely, 2^2166521351 is an apocalyptic number.

2166521351 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166521351 is an equidigital number, since it uses as much as digits as its factorization.

2166521351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 32.

The square root of 2166521351 is about 46545.9058457347. The cubic root of 2166521351 is about 1293.9604167050.

Adding to 2166521351 its reverse (1531256612), we get a palindrome (3697777963).

The spelling of 2166521351 in words is "two billion, one hundred sixty-six million, five hundred twenty-one thousand, three hundred fifty-one".