121722745 has 4 divisors (see below), whose sum is σ = 146067300. Its totient is φ = 97378192.

The previous prime is 121722697. The next prime is 121722749. The reversal of 121722745 is 547227121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 547227121 = 7 ⋅78175303.

It can be written as a sum of positive squares in 2 ways, for example, as 59043856 + 62678889 = 7684^2 + 7917^2 .

It is a cyclic number.

It is not a de Polignac number, because 121722745 - 2⁷ = 121722617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121722749) 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, 12172270 + ... + 12172279.

It is an arithmetic number, because the mean of its divisors is an integer number (36516825).

Almost surely, 2^121722745 is an apocalyptic number.

It is an amenable number.

121722745 is a deficient number, since it is larger than the sum of its proper divisors (24344555).

121722745 is an equidigital number, since it uses as much as digits as its factorization.

121722745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24344554.

The product of its digits is 7840, while the sum is 31.

The square root of 121722745 is about 11032.8031342900. The cubic root of 121722745 is about 495.5915724320.

Adding to 121722745 its reverse (547227121), we get a palindrome (668949866).

The spelling of 121722745 in words is "one hundred twenty-one million, seven hundred twenty-two thousand, seven hundred forty-five".