22021322221 has 16 divisors (see below), whose sum is σ = 23431408000. Its totient is φ = 20637504000.

The previous prime is 22021322209. The next prime is 22021322273. The reversal of 22021322221 is 12222312022.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021322221 is a prime.

It is a super-2 number, since 2×22021322221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021322201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675505 + ... + 707353.

It is an arithmetic number, because the mean of its divisors is an integer number (1464463000).

Almost surely, 2^22021322221 is an apocalyptic number.

It is an amenable number.

22021322221 is a deficient number, since it is larger than the sum of its proper divisors (1410085779).

22021322221 is a wasteful number, since it uses less digits than its factorization.

22021322221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32260.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 22021322221 its reverse (12222312022), we get a palindrome (34243634243).

The spelling of 22021322221 in words is "twenty-two billion, twenty-one million, three hundred twenty-two thousand, two hundred twenty-one".