221129999971 has 2 divisors, whose sum is σ = 221129999972. Its totient is φ = 221129999970.

The previous prime is 221129999941. The next prime is 221130000023. The reversal of 221129999971 is 179999921122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221129999971 - 2⁵ = 221129999939 is a prime.

It is not a weakly prime, because it can be changed into another prime (221129999921) 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, 110564999985 + 110564999986.

It is an arithmetic number, because the mean of its divisors is an integer number (110564999986).

Almost surely, 2^221129999971 is an apocalyptic number.

221129999971 is a deficient number, since it is larger than the sum of its proper divisors (1).

221129999971 is an equidigital number, since it uses as much as digits as its factorization.

221129999971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3306744, while the sum is 61.

The spelling of 221129999971 in words is "two hundred twenty-one billion, one hundred twenty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-one".