22021133231 has 4 divisors (see below), whose sum is σ = 22616299032. Its totient is φ = 21425967432.

The previous prime is 22021133227. The next prime is 22021133257. The reversal of 22021133231 is 13233112022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22021133231 - 2² = 22021133227 is a prime.

It is a super-2 number, since 2×22021133231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021133201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297582845 + ... + 297582918.

It is an arithmetic number, because the mean of its divisors is an integer number (5654074758).

Almost surely, 2^22021133231 is an apocalyptic number.

22021133231 is a deficient number, since it is larger than the sum of its proper divisors (595165801).

22021133231 is an equidigital number, since it uses as much as digits as its factorization.

22021133231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595165800.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 22021133231 its reverse (13233112022), we get a palindrome (35254245253).

The spelling of 22021133231 in words is "twenty-two billion, twenty-one million, one hundred thirty-three thousand, two hundred thirty-one".