221030031997 has 2 divisors, whose sum is σ = 221030031998. Its totient is φ = 221030031996.

The previous prime is 221030031923. The next prime is 221030032019. The reversal of 221030031997 is 799130030122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189528751801 + 31501280196 = 435349^2 + 177486^2 .

It is a cyclic number.

It is not a de Polignac number, because 221030031997 - 2⁷ = 221030031869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221030031907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110515015998 + 110515015999.

It is an arithmetic number, because the mean of its divisors is an integer number (110515015999).

Almost surely, 2^221030031997 is an apocalyptic number.

It is an amenable number.

221030031997 is a deficient number, since it is larger than the sum of its proper divisors (1).

221030031997 is an equidigital number, since it uses as much as digits as its factorization.

221030031997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 221030031997 in words is "two hundred twenty-one billion, thirty million, thirty-one thousand, nine hundred ninety-seven".