21204240022 has 8 divisors (see below), whose sum is σ = 36350125776. Its totient is φ = 9087531432.

The previous prime is 21204240011. The next prime is 21204240037. The reversal of 21204240022 is 22004240212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757294273 + ... + 757294300.

It is an arithmetic number, because the mean of its divisors is an integer number (4543765722).

Almost surely, 2^21204240022 is an apocalyptic number.

21204240022 is a deficient number, since it is larger than the sum of its proper divisors (15145885754).

21204240022 is a wasteful number, since it uses less digits than its factorization.

21204240022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514588582.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21204240022 its reverse (22004240212), we get a palindrome (43208480234).

The spelling of 21204240022 in words is "twenty-one billion, two hundred four million, two hundred forty thousand, twenty-two".