121272865 has 24 divisors (see below), whose sum is σ = 171001152. Its totient is φ = 80879040.

The previous prime is 121272863. The next prime is 121272869. The reversal of 121272865 is 568272121.

It is a happy number.

It is not a de Polignac number, because 121272865 - 2¹ = 121272863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121272865.

It is not an unprimeable number, because it can be changed into a prime (121272863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46650 + ... + 49180.

It is an arithmetic number, because the mean of its divisors is an integer number (7125048).

Almost surely, 2^121272865 is an apocalyptic number.

It is an amenable number.

121272865 is a deficient number, since it is larger than the sum of its proper divisors (49728287).

121272865 is an equidigital number, since it uses as much as digits as its factorization.

121272865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2617 (or 2580 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 121272865 is about 11012.3959699967. The cubic root of 121272865 is about 494.9802597304.

The spelling of 121272865 in words is "one hundred twenty-one million, two hundred seventy-two thousand, eight hundred sixty-five".