21320122042 has 8 divisors (see below), whose sum is σ = 33861370356. Its totient is φ = 10032998592.

The previous prime is 21320122003. The next prime is 21320122049. The reversal of 21320122042 is 24022102312.

It can be written as a sum of positive squares in 2 ways, for example, as 18055028161 + 3265093881 = 134369^2 + 57141^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21320122049) 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, 313531173 + ... + 313531240.

Almost surely, 2^21320122042 is an apocalyptic number.

21320122042 is a deficient number, since it is larger than the sum of its proper divisors (12541248314).

21320122042 is a wasteful number, since it uses less digits than its factorization.

21320122042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627062432.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21320122042 its reverse (24022102312), we get a palindrome (45342224354).

The spelling of 21320122042 in words is "twenty-one billion, three hundred twenty million, one hundred twenty-two thousand, forty-two".