22743721 has 16 divisors (see below), whose sum is σ = 30538368. Its totient is φ = 16358400.

The previous prime is 22743719. The next prime is 22743737. The reversal of 22743721 is 12734722.

It is a cyclic number.

It is not a de Polignac number, because 22743721 - 2¹ = 22743719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22743721.

It is not an unprimeable number, because it can be changed into a prime (22743751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10360 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (1908648).

Almost surely, 2^22743721 is an apocalyptic number.

It is an amenable number.

22743721 is a deficient number, since it is larger than the sum of its proper divisors (7794647).

22743721 is a wasteful number, since it uses less digits than its factorization.

22743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22752.

The product of its digits is 4704, while the sum is 28.

The square root of 22743721 is about 4769.0377436124. The cubic root of 22743721 is about 283.3264845711.

It can be divided in two parts, 2274 and 3721, that added together give a palindrome (5995).

The spelling of 22743721 in words is "twenty-two million, seven hundred forty-three thousand, seven hundred twenty-one".