21223414442 has 4 divisors (see below), whose sum is σ = 31835121666. Its totient is φ = 10611707220.

The previous prime is 21223414417. The next prime is 21223414477. The reversal of 21223414442 is 24441432212.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 20555243641 + 668170801 = 143371^2 + 25849^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305853609 + ... + 5305853612.

Almost surely, 2^21223414442 is an apocalyptic number.

21223414442 is a deficient number, since it is larger than the sum of its proper divisors (10611707224).

21223414442 is a wasteful number, since it uses less digits than its factorization.

21223414442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611707223.

The product of its digits is 12288, while the sum is 29.

Adding to 21223414442 its reverse (24441432212), we get a palindrome (45664846654).

The spelling of 21223414442 in words is "twenty-one billion, two hundred twenty-three million, four hundred fourteen thousand, four hundred forty-two".