121981271 has 2 divisors, whose sum is σ = 121981272. Its totient is φ = 121981270.

The previous prime is 121981253. The next prime is 121981291. The reversal of 121981271 is 172189121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121981271 - 2²⁶ = 54872407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121981291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60990635 + 60990636.

It is an arithmetic number, because the mean of its divisors is an integer number (60990636).

Almost surely, 2^121981271 is an apocalyptic number.

121981271 is a deficient number, since it is larger than the sum of its proper divisors (1).

121981271 is an equidigital number, since it uses as much as digits as its factorization.

121981271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 32.

The square root of 121981271 is about 11044.5131626523. The cubic root of 121981271 is about 495.9421853680.

The spelling of 121981271 in words is "one hundred twenty-one million, nine hundred eighty-one thousand, two hundred seventy-one".