121772571 has 4 divisors (see below), whose sum is σ = 162363432. Its totient is φ = 81181712.

The previous prime is 121772549. The next prime is 121772579. The reversal of 121772571 is 175277121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175277121 = 3 ⋅58425707.

It is a cyclic number.

It is not a de Polignac number, because 121772571 - 2¹⁰ = 121771547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121772579) 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, 20295426 + ... + 20295431.

It is an arithmetic number, because the mean of its divisors is an integer number (40590858).

Almost surely, 2^121772571 is an apocalyptic number.

121772571 is a deficient number, since it is larger than the sum of its proper divisors (40590861).

121772571 is an equidigital number, since it uses as much as digits as its factorization.

121772571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40590860.

The product of its digits is 6860, while the sum is 33.

The square root of 121772571 is about 11035.0609875977. The cubic root of 121772571 is about 495.6591850411.

The spelling of 121772571 in words is "one hundred twenty-one million, seven hundred seventy-two thousand, five hundred seventy-one".