22721042 has 4 divisors (see below), whose sum is σ = 34081566. Its totient is φ = 11360520.

The previous prime is 22721029. The next prime is 22721051. The reversal of 22721042 is 24012722.

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 only one way, i.e., 14432401 + 8288641 = 3799^2 + 2879^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5680259 + ... + 5680262.

Almost surely, 2^22721042 is an apocalyptic number.

22721042 is a deficient number, since it is larger than the sum of its proper divisors (11360524).

22721042 is a wasteful number, since it uses less digits than its factorization.

22721042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360523.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 22721042 is about 4766.6594172439. The cubic root of 22721042 is about 283.2322798411.

Adding to 22721042 its reverse (24012722), we get a palindrome (46733764).

The spelling of 22721042 in words is "twenty-two million, seven hundred twenty-one thousand, forty-two".