22260721 has 4 divisors (see below), whose sum is σ = 25440832. Its totient is φ = 19080612.

The previous prime is 22260709. The next prime is 22260727. The reversal of 22260721 is 12706222.

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: 12706222 = 2 ⋅6353111.

It is a cyclic number.

It is not a de Polignac number, because 22260721 - 2⁷ = 22260593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22260692 and 22260701.

It is not an unprimeable number, because it can be changed into a prime (22260727) 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, 1590045 + ... + 1590058.

It is an arithmetic number, because the mean of its divisors is an integer number (6360208).

Almost surely, 2^22260721 is an apocalyptic number.

It is an amenable number.

22260721 is a deficient number, since it is larger than the sum of its proper divisors (3180111).

22260721 is an equidigital number, since it uses as much as digits as its factorization.

22260721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180110.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 22260721 is about 4718.1268528941. The cubic root of 22260721 is about 281.3064837337.

Adding to 22260721 its reverse (12706222), we get a palindrome (34966943).

The spelling of 22260721 in words is "twenty-two million, two hundred sixty thousand, seven hundred twenty-one".