21013022242 has 16 divisors (see below), whose sum is σ = 31750694712. Its totient is φ = 10429585920.

The previous prime is 21013022183. The next prime is 21013022273. The reversal of 21013022242 is 24222031012.

It can be written as a sum of positive squares in 4 ways, for example, as 10611266121 + 10401756121 = 103011^2 + 101989^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301618 + ... + 364690.

Almost surely, 2^21013022242 is an apocalyptic number.

21013022242 is a deficient number, since it is larger than the sum of its proper divisors (10737672470).

21013022242 is a wasteful number, since it uses less digits than its factorization.

21013022242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64293.

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

Adding to 21013022242 its reverse (24222031012), we get a palindrome (45235053254).

The spelling of 21013022242 in words is "twenty-one billion, thirteen million, twenty-two thousand, two hundred forty-two".