121972307 has 4 divisors (see below), whose sum is σ = 121998240. Its totient is φ = 121946376.

The previous prime is 121972273. The next prime is 121972309. The reversal of 121972307 is 703279121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 703279121 = 13687 ⋅51383.

It is a cyclic number.

It is not a de Polignac number, because 121972307 - 2⁸ = 121972051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121972309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707 + ... + 16052.

It is an arithmetic number, because the mean of its divisors is an integer number (30499560).

Almost surely, 2^121972307 is an apocalyptic number.

121972307 is a deficient number, since it is larger than the sum of its proper divisors (25933).

121972307 is an equidigital number, since it uses as much as digits as its factorization.

121972307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25932.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 121972307 is about 11044.1073428322. The cubic root of 121972307 is about 495.9300366870.

The spelling of 121972307 in words is "one hundred twenty-one million, nine hundred seventy-two thousand, three hundred seven".