22721245 has 8 divisors (see below), whose sum is σ = 28700640. Its totient is φ = 17220240.

The previous prime is 22721227. The next prime is 22721261. The reversal of 22721245 is 54212722.

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

It is not a de Polignac number, because 22721245 - 2⁷ = 22721117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119491 + ... + 119680.

It is an arithmetic number, because the mean of its divisors is an integer number (3587580).

Almost surely, 2^22721245 is an apocalyptic number.

It is an amenable number.

22721245 is a deficient number, since it is larger than the sum of its proper divisors (5979395).

22721245 is a wasteful number, since it uses less digits than its factorization.

22721245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239195.

The product of its digits is 2240, while the sum is 25.

The square root of 22721245 is about 4766.6807109350. The cubic root of 22721245 is about 283.2331233468.

Adding to 22721245 its reverse (54212722), we get a palindrome (76933967).

The spelling of 22721245 in words is "twenty-two million, seven hundred twenty-one thousand, two hundred forty-five".