22201901 has 4 divisors (see below), whose sum is σ = 22398492. Its totient is φ = 22005312.

The previous prime is 22201891. The next prime is 22201903. The reversal of 22201901 is 10910222.

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 4519876 + 17682025 = 2126^2 + 4205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22201901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22201901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98126 + ... + 98351.

It is an arithmetic number, because the mean of its divisors is an integer number (5599623).

Almost surely, 2^22201901 is an apocalyptic number.

It is an amenable number.

22201901 is a deficient number, since it is larger than the sum of its proper divisors (196591).

22201901 is a wasteful number, since it uses less digits than its factorization.

22201901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196590.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 22201901 is about 4711.8893238275. The cubic root of 22201901 is about 281.0584977186.

The spelling of 22201901 in words is "twenty-two million, two hundred one thousand, nine hundred one".