221996815699 has 2 divisors, whose sum is σ = 221996815700. Its totient is φ = 221996815698.

The previous prime is 221996815697. The next prime is 221996815717. The reversal of 221996815699 is 996518699122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221996815699 - 2¹ = 221996815697 is a prime.

Together with 221996815697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221996815697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110998407849 + 110998407850.

It is an arithmetic number, because the mean of its divisors is an integer number (110998407850).

Almost surely, 2^221996815699 is an apocalyptic number.

221996815699 is a deficient number, since it is larger than the sum of its proper divisors (1).

221996815699 is an equidigital number, since it uses as much as digits as its factorization.

221996815699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37791360, while the sum is 67.

The spelling of 221996815699 in words is "two hundred twenty-one billion, nine hundred ninety-six million, eight hundred fifteen thousand, six hundred ninety-nine".