197979221 has 32 divisors (see below), whose sum is σ = 236234880. Its totient is φ = 163987200.

The previous prime is 197979209. The next prime is 197979227. The reversal of 197979221 is 122979791.

It is a cyclic number.

It is not a de Polignac number, because 197979221 - 2¹⁸ = 197717077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197979227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 675551 + ... + 675843.

It is an arithmetic number, because the mean of its divisors is an integer number (7382340).

Almost surely, 2^197979221 is an apocalyptic number.

197979221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

197979221 is a deficient number, since it is larger than the sum of its proper divisors (38255659).

197979221 is a wasteful number, since it uses less digits than its factorization.

197979221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its digits is 142884, while the sum is 47.

The square root of 197979221 is about 14070.5089104837. The cubic root of 197979221 is about 582.8272787370.

The spelling of 197979221 in words is "one hundred ninety-seven million, nine hundred seventy-nine thousand, two hundred twenty-one".