72722121 has 8 divisors (see below), whose sum is σ = 97923264. Its totient is φ = 48001200.

The previous prime is 72722099. The next prime is 72722129. The reversal of 72722121 is 12122727.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72722121 - 2¹⁷ = 72591049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72722091 and 72722100.

It is not an unprimeable number, because it can be changed into a prime (72722129) 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 7 ways as a sum of consecutive naturals, for example, 119701 + ... + 120306.

It is an arithmetic number, because the mean of its divisors is an integer number (12240408).

Almost surely, 2^72722121 is an apocalyptic number.

It is an amenable number.

72722121 is a deficient number, since it is larger than the sum of its proper divisors (25201143).

72722121 is a wasteful number, since it uses less digits than its factorization.

72722121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240111.

The product of its digits is 784, while the sum is 24.

The square root of 72722121 is about 8527.7266020904. The cubic root of 72722121 is about 417.4029482660.

Adding to 72722121 its reverse (12122727), we get a palindrome (84844848).

The spelling of 72722121 in words is "seventy-two million, seven hundred twenty-two thousand, one hundred twenty-one".