22215145643 has 4 divisors (see below), whose sum is σ = 22250352528. Its totient is φ = 22179938760.

The previous prime is 22215145639. The next prime is 22215145649. The reversal of 22215145643 is 34654151222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34654151222 = 2 ⋅17327075611.

It is a cyclic number.

It is not a de Polignac number, because 22215145643 - 2² = 22215145639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22215145649) 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, 17602496 + ... + 17603757.

It is an arithmetic number, because the mean of its divisors is an integer number (5562588132).

Almost surely, 2^22215145643 is an apocalyptic number.

22215145643 is a deficient number, since it is larger than the sum of its proper divisors (35206885).

22215145643 is an equidigital number, since it uses as much as digits as its factorization.

22215145643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35206884.

The product of its digits is 57600, while the sum is 35.

Adding to 22215145643 its reverse (34654151222), we get a palindrome (56869296865).

The spelling of 22215145643 in words is "twenty-two billion, two hundred fifteen million, one hundred forty-five thousand, six hundred forty-three".