21444020222 has 4 divisors (see below), whose sum is σ = 32166030336. Its totient is φ = 10722010110.

The previous prime is 21444020189. The next prime is 21444020243. The reversal of 21444020222 is 22202044412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5361005054 + ... + 5361005057.

It is an arithmetic number, because the mean of its divisors is an integer number (8041507584).

Almost surely, 2^21444020222 is an apocalyptic number.

21444020222 is a deficient number, since it is larger than the sum of its proper divisors (10722010114).

21444020222 is a wasteful number, since it uses less digits than its factorization.

21444020222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10722010113.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 21444020222 its reverse (22202044412), we get a palindrome (43646064634).

The spelling of 21444020222 in words is "twenty-one billion, four hundred forty-four million, twenty thousand, two hundred twenty-two".