21213334242 has 64 divisors (see below), whose sum is σ = 47979331200. Its totient is φ = 6945523200.

The previous prime is 21213334237. The next prime is 21213334253. The reversal of 21213334242 is 24243331212.

21213334242 is a `hidden beast` number, since 21 + 213 + 3 + 3 + 424 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5736138 + ... + 5739834.

It is an arithmetic number, because the mean of its divisors is an integer number (749677050).

Almost surely, 2^21213334242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213334242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23989665600).

21213334242 is an abundant number, since it is smaller than the sum of its proper divisors (26765996958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21213334242 is a wasteful number, since it uses less digits than its factorization.

21213334242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5568 (or 5562 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 21213334242 its reverse (24243331212), we get a palindrome (45456665454).

The spelling of 21213334242 in words is "twenty-one billion, two hundred thirteen million, three hundred thirty-four thousand, two hundred forty-two".