22721273 has 4 divisors (see below), whose sum is σ = 22812048. Its totient is φ = 22630500.

The previous prime is 22721267. The next prime is 22721287. The reversal of 22721273 is 37212722.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37212722 = 2 ⋅18606361.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22721273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22721873) 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, 45011 + ... + 45512.

It is an arithmetic number, because the mean of its divisors is an integer number (5703012).

Almost surely, 2^22721273 is an apocalyptic number.

It is an amenable number.

22721273 is a deficient number, since it is larger than the sum of its proper divisors (90775).

22721273 is an equidigital number, since it uses as much as digits as its factorization.

22721273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90774.

The product of its digits is 2352, while the sum is 26.

The square root of 22721273 is about 4766.6836479884. The cubic root of 22721273 is about 283.2332396920.

Adding to 22721273 its reverse (37212722), we get a palindrome (59933995).

The spelling of 22721273 in words is "twenty-two million, seven hundred twenty-one thousand, two hundred seventy-three".