22011601 has 4 divisors (see below), whose sum is σ = 22063104. Its totient is φ = 21960100.

The previous prime is 22011553. The next prime is 22011607. The reversal of 22011601 is 10611022.

22011601 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10611022 = 2 ⋅5305511.

It is a cyclic number.

It is not a de Polignac number, because 22011601 - 2⁹ = 22011089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22011607) 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, 25105 + ... + 25966.

It is an arithmetic number, because the mean of its divisors is an integer number (5515776).

Almost surely, 2^22011601 is an apocalyptic number.

It is an amenable number.

22011601 is a deficient number, since it is larger than the sum of its proper divisors (51503).

22011601 is an equidigital number, since it uses as much as digits as its factorization.

22011601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51502.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 22011601 is about 4691.6522675919. The cubic root of 22011601 is about 280.2531766204.

Adding to 22011601 its reverse (10611022), we get a palindrome (32622623).

The spelling of 22011601 in words is "twenty-two million, eleven thousand, six hundred one".