197222065921 has 4 divisors (see below), whose sum is σ = 198967394052. Its totient is φ = 195476737792.

The previous prime is 197222065903. The next prime is 197222065969. The reversal of 197222065921 is 129560222791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12032993025 + 185189072896 = 109695^2 + 430336^2 .

It is a cyclic number.

It is not a de Polignac number, because 197222065921 - 2⁹ = 197222065409 is a prime.

It is a super-2 number, since 2×197222065921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197222065991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872663896 + ... + 872664121.

It is an arithmetic number, because the mean of its divisors is an integer number (49741848513).

Almost surely, 2^197222065921 is an apocalyptic number.

It is an amenable number.

197222065921 is a deficient number, since it is larger than the sum of its proper divisors (1745328131).

197222065921 is a wasteful number, since it uses less digits than its factorization.

197222065921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745328130.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 197222065921 in words is "one hundred ninety-seven billion, two hundred twenty-two million, sixty-five thousand, nine hundred twenty-one".