21422222443 has 4 divisors (see below), whose sum is σ = 21446539128. Its totient is φ = 21397905760.

The previous prime is 21422222399. The next prime is 21422222501. The reversal of 21422222443 is 34422222412.

It is a happy number.

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 21422222443 - 2²¹ = 21420125291 is a prime.

It is a super-2 number, since 2×21422222443² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21422222243) 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, 12157021 + ... + 12158782.

It is an arithmetic number, because the mean of its divisors is an integer number (5361634782).

Almost surely, 2^21422222443 is an apocalyptic number.

21422222443 is a deficient number, since it is larger than the sum of its proper divisors (24316685).

21422222443 is an equidigital number, since it uses as much as digits as its factorization.

21422222443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24316684.

The product of its digits is 12288, while the sum is 28.

Adding to 21422222443 its reverse (34422222412), we get a palindrome (55844444855).

The spelling of 21422222443 in words is "twenty-one billion, four hundred twenty-two million, two hundred twenty-two thousand, four hundred forty-three".