121740871 has 4 divisors (see below), whose sum is σ = 139132432. Its totient is φ = 104349312.

The previous prime is 121740851. The next prime is 121740877. The reversal of 121740871 is 178047121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178047121 = 7 ⋅25435303.

It is a cyclic number.

It is not a de Polignac number, because 121740871 - 2⁷ = 121740743 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 (121740877) 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, 8695770 + ... + 8695783.

It is an arithmetic number, because the mean of its divisors is an integer number (34783108).

Almost surely, 2^121740871 is an apocalyptic number.

121740871 is a deficient number, since it is larger than the sum of its proper divisors (17391561).

121740871 is an equidigital number, since it uses as much as digits as its factorization.

121740871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17391560.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 121740871 is about 11033.6245631252. The cubic root of 121740871 is about 495.6161710857.

Adding to 121740871 its reverse (178047121), we get a palindrome (299787992).

The spelling of 121740871 in words is "one hundred twenty-one million, seven hundred forty thousand, eight hundred seventy-one".