22151234221 has 8 divisors (see below), whose sum is σ = 22324075488. Its totient is φ = 21978450000.

The previous prime is 22151234219. The next prime is 22151234239. The reversal of 22151234221 is 12243215122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22151234221 - 2¹ = 22151234219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22151234201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1103686 + ... + 1123576.

It is an arithmetic number, because the mean of its divisors is an integer number (2790509436).

Almost surely, 2^22151234221 is an apocalyptic number.

It is an amenable number.

22151234221 is a deficient number, since it is larger than the sum of its proper divisors (172841267).

22151234221 is a wasteful number, since it uses less digits than its factorization.

22151234221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28523.

The product of its digits is 1920, while the sum is 25.

Adding to 22151234221 its reverse (12243215122), we get a palindrome (34394449343).

The spelling of 22151234221 in words is "twenty-two billion, one hundred fifty-one million, two hundred thirty-four thousand, two hundred twenty-one".