22231033331221 has 64 divisors (see below), whose sum is σ = 28735793694720. Its totient is φ = 16876553379840.

The previous prime is 22231033331209. The next prime is 22231033331237. The reversal of 22231033331221 is 12213333013222.

It is a happy number.

It is not a de Polignac number, because 22231033331221 - 2¹³ = 22231033323029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22231033331221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22231033331251) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15014241 + ... + 16428313.

It is an arithmetic number, because the mean of its divisors is an integer number (448996776480).

Almost surely, 2^{22231033331221} is an apocalyptic number.

It is an amenable number.

22231033331221 is a deficient number, since it is larger than the sum of its proper divisors (6504760363499).

22231033331221 is a wasteful number, since it uses less digits than its factorization.

22231033331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414366.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 22231033331221 its reverse (12213333013222), we get a palindrome (34444366344443).

The spelling of 22231033331221 in words is "twenty-two trillion, two hundred thirty-one billion, thirty-three million, three hundred thirty-one thousand, two hundred twenty-one".