221142071 has 2 divisors, whose sum is σ = 221142072. Its totient is φ = 221142070.

The previous prime is 221142049. The next prime is 221142073. The reversal of 221142071 is 170241122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221142071 - 2¹⁸ = 220879927 is a prime.

Together with 221142073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221142073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571035 + 110571036.

It is an arithmetic number, because the mean of its divisors is an integer number (110571036).

Almost surely, 2^221142071 is an apocalyptic number.

221142071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221142071 is an equidigital number, since it uses as much as digits as its factorization.

221142071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 221142071 is about 14870.8463444419. The cubic root of 221142071 is about 604.7238873927.

Adding to 221142071 its reverse (170241122), we get a palindrome (391383193).

The spelling of 221142071 in words is "two hundred twenty-one million, one hundred forty-two thousand, seventy-one".