21332106442 has 4 divisors (see below), whose sum is σ = 31998159666. Its totient is φ = 10666053220.

The previous prime is 21332106437. The next prime is 21332106461. The reversal of 21332106442 is 24460123312.

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., 19110021121 + 2222085321 = 138239^2 + 47139^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21332106442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333026609 + ... + 5333026612.

Almost surely, 2^21332106442 is an apocalyptic number.

21332106442 is a deficient number, since it is larger than the sum of its proper divisors (10666053224).

21332106442 is a wasteful number, since it uses less digits than its factorization.

21332106442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10666053223.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21332106442 its reverse (24460123312), we get a palindrome (45792229754).

The spelling of 21332106442 in words is "twenty-one billion, three hundred thirty-two million, one hundred six thousand, four hundred forty-two".