22250721 has 8 divisors (see below), whose sum is σ = 29700064. Its totient is φ = 14817600.

The previous prime is 22250719. The next prime is 22250731. The reversal of 22250721 is 12705222.

It is a happy number.

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

It is not a de Polignac number, because 22250721 - 2¹ = 22250719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22250731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (3712508).

Almost surely, 2^22250721 is an apocalyptic number.

It is an amenable number.

22250721 is a deficient number, since it is larger than the sum of its proper divisors (7449343).

22250721 is a wasteful number, since it uses less digits than its factorization.

22250721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8111.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 22250721 is about 4717.0669912563. The cubic root of 22250721 is about 281.2643544279.

Adding to 22250721 its reverse (12705222), we get a palindrome (34955943).

The spelling of 22250721 in words is "twenty-two million, two hundred fifty thousand, seven hundred twenty-one".