22012013221 has 4 divisors (see below), whose sum is σ = 24013105344. Its totient is φ = 20010921100.

The previous prime is 22012013197. The next prime is 22012013227. The reversal of 22012013221 is 12231021022.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 22012013221 - 2²¹ = 22009916069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012013195 and 22012013204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012013227) 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, 1000546045 + ... + 1000546066.

It is an arithmetic number, because the mean of its divisors is an integer number (6003276336).

Almost surely, 2^22012013221 is an apocalyptic number.

It is an amenable number.

22012013221 is a deficient number, since it is larger than the sum of its proper divisors (2001092123).

22012013221 is a wasteful number, since it uses less digits than its factorization.

22012013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001092122.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22012013221 its reverse (12231021022), we get a palindrome (34243034243).

The spelling of 22012013221 in words is "twenty-two billion, twelve million, thirteen thousand, two hundred twenty-one".