197942072221 has 2 divisors, whose sum is σ = 197942072222. Its totient is φ = 197942072220.

The previous prime is 197942072201. The next prime is 197942072233. The reversal of 197942072221 is 122270249791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126637051321 + 71305020900 = 355861^2 + 267030^2 .

It is a cyclic number.

It is not a de Polignac number, because 197942072221 - 2⁷ = 197942072093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197942072201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98971036110 + 98971036111.

It is an arithmetic number, because the mean of its divisors is an integer number (98971036111).

Almost surely, 2^197942072221 is an apocalyptic number.

It is an amenable number.

197942072221 is a deficient number, since it is larger than the sum of its proper divisors (1).

197942072221 is an equidigital number, since it uses as much as digits as its factorization.

197942072221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 197942072221 in words is "one hundred ninety-seven billion, nine hundred forty-two million, seventy-two thousand, two hundred twenty-one".