22750721 has 16 divisors (see below), whose sum is σ = 26634240. Its totient is φ = 19031760.

The previous prime is 22750699. The next prime is 22750723. The reversal of 22750721 is 12705722.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22750721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22750723) 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, 83816 + ... + 84086.

It is an arithmetic number, because the mean of its divisors is an integer number (1664640).

Almost surely, 2^22750721 is an apocalyptic number.

It is an amenable number.

22750721 is a deficient number, since it is larger than the sum of its proper divisors (3883519).

22750721 is a wasteful number, since it uses less digits than its factorization.

22750721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 22750721 is about 4769.7715878226. The cubic root of 22750721 is about 283.3555487387.

The spelling of 22750721 in words is "twenty-two million, seven hundred fifty thousand, seven hundred twenty-one".