221304019997 has 2 divisors, whose sum is σ = 221304019998. Its totient is φ = 221304019996.

The previous prime is 221304019939. The next prime is 221304020017. The reversal of 221304019997 is 799910403122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131387400676 + 89916619321 = 362474^2 + 299861^2 .

It is a cyclic number.

It is not a de Polignac number, because 221304019997 - 2³⁶ = 152584543261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221304019897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110652009998 + 110652009999.

It is an arithmetic number, because the mean of its divisors is an integer number (110652009999).

Almost surely, 2^221304019997 is an apocalyptic number.

It is an amenable number.

221304019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221304019997 is an equidigital number, since it uses as much as digits as its factorization.

221304019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 221304019997 in words is "two hundred twenty-one billion, three hundred four million, nineteen thousand, nine hundred ninety-seven".