21332146442 has 4 divisors (see below), whose sum is σ = 31998219666. Its totient is φ = 10666073220.

The previous prime is 21332146417. The next prime is 21332146483. The reversal of 21332146442 is 24464123312.

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., 17782489201 + 3549657241 = 133351^2 + 59579^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21332146399 and 21332146408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333036609 + ... + 5333036612.

Almost surely, 2^21332146442 is an apocalyptic number.

21332146442 is a deficient number, since it is larger than the sum of its proper divisors (10666073224).

21332146442 is a wasteful number, since it uses less digits than its factorization.

21332146442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666073223.

The product of its digits is 27648, while the sum is 32.

Adding to 21332146442 its reverse (24464123312), we get a palindrome (45796269754).

The spelling of 21332146442 in words is "twenty-one billion, three hundred thirty-two million, one hundred forty-six thousand, four hundred forty-two".