21222423151 has 4 divisors (see below), whose sum is σ = 21226915600. Its totient is φ = 21217930704.

The previous prime is 21222423149. The next prime is 21222423223. The reversal of 21222423151 is 15132422212.

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 21222423151 - 2¹ = 21222423149 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 (21222423451) 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, 2239131 + ... + 2248588.

It is an arithmetic number, because the mean of its divisors is an integer number (5306728900).

Almost surely, 2^21222423151 is an apocalyptic number.

21222423151 is a deficient number, since it is larger than the sum of its proper divisors (4492449).

21222423151 is an equidigital number, since it uses as much as digits as its factorization.

21222423151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4492448.

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

Adding to 21222423151 its reverse (15132422212), we get a palindrome (36354845363).

The spelling of 21222423151 in words is "twenty-one billion, two hundred twenty-two million, four hundred twenty-three thousand, one hundred fifty-one".