21213320242 has 8 divisors (see below), whose sum is σ = 31873104000. Its totient is φ = 10588952244.

The previous prime is 21213320237. The next prime is 21213320291. The reversal of 21213320242 is 24202331212.

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

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, 8852442 + ... + 8854837.

It is an arithmetic number, because the mean of its divisors is an integer number (3984138000).

Almost surely, 2^21213320242 is an apocalyptic number.

21213320242 is a deficient number, since it is larger than the sum of its proper divisors (10659783758).

21213320242 is a wasteful number, since it uses less digits than its factorization.

21213320242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17707880.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21213320242 its reverse (24202331212), we get a palindrome (45415651454).

The spelling of 21213320242 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred forty-two".