221463871 has 2 divisors, whose sum is σ = 221463872. Its totient is φ = 221463870.

The previous prime is 221463797. The next prime is 221463881. The reversal of 221463871 is 178364122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221463871 - 2¹³ = 221455679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221463881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110731935 + 110731936.

It is an arithmetic number, because the mean of its divisors is an integer number (110731936).

Almost surely, 2^221463871 is an apocalyptic number.

221463871 is a deficient number, since it is larger than the sum of its proper divisors (1).

221463871 is an equidigital number, since it uses as much as digits as its factorization.

221463871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 34.

The square root of 221463871 is about 14881.6622391452. The cubic root of 221463871 is about 605.0170712119.

The spelling of 221463871 in words is "two hundred twenty-one million, four hundred sixty-three thousand, eight hundred seventy-one".