121665271 has 16 divisors (see below), whose sum is σ = 150191104. Its totient is φ = 95973984.

The previous prime is 121665253. The next prime is 121665283. The reversal of 121665271 is 172566121.

It is a cyclic number.

It is not a de Polignac number, because 121665271 - 2⁷ = 121665143 is a prime.

It is a super-3 number, since 3×121665271³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121665241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31576 + ... + 35218.

It is an arithmetic number, because the mean of its divisors is an integer number (9386944).

Almost surely, 2^121665271 is an apocalyptic number.

121665271 is a deficient number, since it is larger than the sum of its proper divisors (28525833).

121665271 is a wasteful number, since it uses less digits than its factorization.

121665271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4030.

The product of its digits is 5040, while the sum is 31.

The square root of 121665271 is about 11030.1981396528. The cubic root of 121665271 is about 495.5135587617.

The spelling of 121665271 in words is "one hundred twenty-one million, six hundred sixty-five thousand, two hundred seventy-one".