22324721 has 4 divisors (see below), whose sum is σ = 22448244. Its totient is φ = 22201200.

The previous prime is 22324717. The next prime is 22324741. The reversal of 22324721 is 12742322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10491121 + 11833600 = 3239^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 22324721 - 2² = 22324717 is a prime.

It is a super-3 number, since 3×22324721³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22324741) 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 3 ways as a sum of consecutive naturals, for example, 61490 + ... + 61851.

It is an arithmetic number, because the mean of its divisors is an integer number (5612061).

Almost surely, 2^22324721 is an apocalyptic number.

It is an amenable number.

22324721 is a deficient number, since it is larger than the sum of its proper divisors (123523).

22324721 is a wasteful number, since it uses less digits than its factorization.

22324721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123522.

The product of its digits is 1344, while the sum is 23.

The square root of 22324721 is about 4724.9043376559. The cubic root of 22324721 is about 281.5758129689.

The spelling of 22324721 in words is "twenty-two million, three hundred twenty-four thousand, seven hundred twenty-one".