22011001 has 2 divisors, whose sum is σ = 22011002. Its totient is φ = 22011000.

The previous prime is 22010999. The next prime is 22011037. The reversal of 22011001 is 10011022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20939776 + 1071225 = 4576^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 22011001 - 2¹ = 22010999 is a prime.

Together with 22010999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22011091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11005500 + 11005501.

It is an arithmetic number, because the mean of its divisors is an integer number (11005501).

Almost surely, 2^22011001 is an apocalyptic number.

It is an amenable number.

22011001 is a deficient number, since it is larger than the sum of its proper divisors (1).

22011001 is an equidigital number, since it uses as much as digits as its factorization.

22011001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 22011001 is about 4691.5883237982. The cubic root of 22011001 is about 280.2506301839.

Adding to 22011001 its reverse (10011022), we get a palindrome (32022023).

The spelling of 22011001 in words is "twenty-two million, eleven thousand, one".