221214073 has 2 divisors, whose sum is σ = 221214074. Its totient is φ = 221214072.

The previous prime is 221214053. The next prime is 221214089. The reversal of 221214073 is 370412122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149523984 + 71690089 = 12228^2 + 8467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221214073 is a prime.

It is not a weakly prime, because it can be changed into another prime (221214043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110607036 + 110607037.

It is an arithmetic number, because the mean of its divisors is an integer number (110607037).

Almost surely, 2^221214073 is an apocalyptic number.

It is an amenable number.

221214073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221214073 is an equidigital number, since it uses as much as digits as its factorization.

221214073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221214073 is about 14873.2670587198. The cubic root of 221214073 is about 604.7895112764.

Adding to 221214073 its reverse (370412122), we get a palindrome (591626195).

The spelling of 221214073 in words is "two hundred twenty-one million, two hundred fourteen thousand, seventy-three".