21222134431 has 8 divisors (see below), whose sum is σ = 22908451680. Its totient is φ = 19599451872.

The previous prime is 21222134377. The next prime is 21222134441. The reversal of 21222134431 is 13443122212.

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

It is not a de Polignac number, because 21222134431 - 2³¹ = 19074650783 is a prime.

It is a super-2 number, since 2×21222134431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222134396 and 21222134405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222134441) 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 7 ways as a sum of consecutive naturals, for example, 15907980 + ... + 15909313.

It is an arithmetic number, because the mean of its divisors is an integer number (2863556460).

Almost surely, 2^21222134431 is an apocalyptic number.

21222134431 is a deficient number, since it is larger than the sum of its proper divisors (1686317249).

21222134431 is a wasteful number, since it uses less digits than its factorization.

21222134431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31817345.

The product of its digits is 2304, while the sum is 25.

Adding to 21222134431 its reverse (13443122212), we get a palindrome (34665256643).

The spelling of 21222134431 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-four thousand, four hundred thirty-one".