22212147421 has 8 divisors (see below), whose sum is σ = 22432548600. Its totient is φ = 21992048640.

The previous prime is 22212147401. The next prime is 22212147469. The reversal of 22212147421 is 12474121222.

It can be written as a sum of positive squares in 4 ways, for example, as 5418579321 + 16793568100 = 73611^2 + 129590^2 .

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 22212147421 - 2²⁹ = 21675276509 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 22212147421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212147401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73485 + ... + 223213.

It is an arithmetic number, because the mean of its divisors is an integer number (2804068575).

Almost surely, 2^22212147421 is an apocalyptic number.

It is an amenable number.

22212147421 is a deficient number, since it is larger than the sum of its proper divisors (220401179).

22212147421 is a wasteful number, since it uses less digits than its factorization.

22212147421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151199.

The product of its digits is 3584, while the sum is 28.

Adding to 22212147421 its reverse (12474121222), we get a palindrome (34686268643).

The spelling of 22212147421 in words is "twenty-two billion, two hundred twelve million, one hundred forty-seven thousand, four hundred twenty-one".