21202012442 has 8 divisors (see below), whose sum is σ = 34249404756. Its totient is φ = 9785544192.

The previous prime is 21202012441. The next prime is 21202012457. The reversal of 21202012442 is 24421020212.

It can be written as a sum of positive squares in 2 ways, for example, as 21147267241 + 54745201 = 145421^2 + 7399^2 .

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 (21202012441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407730983 + ... + 407731034.

Almost surely, 2^21202012442 is an apocalyptic number.

21202012442 is a deficient number, since it is larger than the sum of its proper divisors (13047392314).

21202012442 is a wasteful number, since it uses less digits than its factorization.

21202012442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815462032.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202012442 its reverse (24421020212), we get a palindrome (45623032654).

The spelling of 21202012442 in words is "twenty-one billion, two hundred two million, twelve thousand, four hundred forty-two".