22000013 has 4 divisors (see below), whose sum is σ = 25142880. Its totient is φ = 18857148.

The previous prime is 22000003. The next prime is 22000021. The reversal of 22000013 is 31000022.

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: 31000022 = 2 ⋅15500011.

It is a cyclic number.

It is not a de Polignac number, because 22000013 - 2¹⁰ = 21998989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000003) 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, 1571423 + ... + 1571436.

It is an arithmetic number, because the mean of its divisors is an integer number (6285720).

Almost surely, 2^22000013 is an apocalyptic number.

It is an amenable number.

22000013 is a deficient number, since it is larger than the sum of its proper divisors (3142867).

22000013 is an equidigital number, since it uses as much as digits as its factorization.

22000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3142866.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 22000013 is about 4690.4171456279. The cubic root of 22000013 is about 280.2039882572.

Adding to 22000013 its reverse (31000022), we get a palindrome (53000035).

Subtracting 22000013 from its reverse (31000022), we obtain a palindrome (9000009).

The spelling of 22000013 in words is "twenty-two million, thirteen", and thus it is an aban number and an uban number.