221100209971 has 2 divisors, whose sum is σ = 221100209972. Its totient is φ = 221100209970.

The previous prime is 221100209963. The next prime is 221100210029. The reversal of 221100209971 is 179902001122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221100209971 - 2³ = 221100209963 is a prime.

It is not a weakly prime, because it can be changed into another prime (221100209171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110550104985 + 110550104986.

It is an arithmetic number, because the mean of its divisors is an integer number (110550104986).

Almost surely, 2^221100209971 is an apocalyptic number.

221100209971 is a deficient number, since it is larger than the sum of its proper divisors (1).

221100209971 is an equidigital number, since it uses as much as digits as its factorization.

221100209971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The spelling of 221100209971 in words is "two hundred twenty-one billion, one hundred million, two hundred nine thousand, nine hundred seventy-one".