221111219971 has 2 divisors, whose sum is σ = 221111219972. Its totient is φ = 221111219970.

The previous prime is 221111219963. The next prime is 221111220013. The reversal of 221111219971 is 179912111122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221111219971 - 2³ = 221111219963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221111219971.

It is not a weakly prime, because it can be changed into another prime (221111219071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555609985 + 110555609986.

It is an arithmetic number, because the mean of its divisors is an integer number (110555609986).

Almost surely, 2^221111219971 is an apocalyptic number.

221111219971 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111219971 is an equidigital number, since it uses as much as digits as its factorization.

221111219971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 37.

The spelling of 221111219971 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred nineteen thousand, nine hundred seventy-one".