22405121 has 4 divisors (see below), whose sum is σ = 22442052. Its totient is φ = 22368192.

The previous prime is 22405079. The next prime is 22405153. The reversal of 22405121 is 12150422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12150422 = 2 ⋅6075211.

It can be written as a sum of positive squares in 2 ways, for example, as 1575025 + 20830096 = 1255^2 + 4564^2 .

It is a cyclic number.

It is not a de Polignac number, because 22405121 - 2¹⁸ = 22142977 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 22405121.

It is not an unprimeable number, because it can be changed into a prime (22405181) 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, 17540 + ... + 18773.

It is an arithmetic number, because the mean of its divisors is an integer number (5610513).

It is a Proth number, since it is equal to 2735 ⋅ 2¹³ + 1 and 2735 < 2¹³.

Almost surely, 2^22405121 is an apocalyptic number.

It is an amenable number.

22405121 is a deficient number, since it is larger than the sum of its proper divisors (36931).

22405121 is an equidigital number, since it uses as much as digits as its factorization.

22405121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36930.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 22405121 is about 4733.4047999300. The cubic root of 22405121 is about 281.9134293225.

Adding to 22405121 its reverse (12150422), we get a palindrome (34555543).

The spelling of 22405121 in words is "twenty-two million, four hundred five thousand, one hundred twenty-one".