121271897 has 8 divisors (see below), whose sum is σ = 130829256. Its totient is φ = 111983872.

The previous prime is 121271879. The next prime is 121271929. The reversal of 121271897 is 798172121.

It can be written as a sum of positive squares in 4 ways, for example, as 17007376 + 104264521 = 4124^2 + 10211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121271897 - 2⁶ = 121271833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121271897.

It is not an unprimeable number, because it can be changed into a prime (121271807) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66398 + ... + 68199.

It is an arithmetic number, because the mean of its divisors is an integer number (16353657).

Almost surely, 2^121271897 is an apocalyptic number.

121271897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121271897 is a deficient number, since it is larger than the sum of its proper divisors (9557359).

121271897 is a wasteful number, since it uses less digits than its factorization.

121271897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134667.

The product of its digits is 14112, while the sum is 38.

The square root of 121271897 is about 11012.3520194371. The cubic root of 121271897 is about 494.9789427494.

The spelling of 121271897 in words is "one hundred twenty-one million, two hundred seventy-one thousand, eight hundred ninety-seven".