21210343442 has 8 divisors (see below), whose sum is σ = 31851548976. Its totient is φ = 10593160452.

The previous prime is 21210343439. The next prime is 21210343477. The reversal of 21210343442 is 24434301212.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6003428 + ... + 6006959.

It is an arithmetic number, because the mean of its divisors is an integer number (3981443622).

Almost surely, 2^21210343442 is an apocalyptic number.

21210343442 is a deficient number, since it is larger than the sum of its proper divisors (10641205534).

21210343442 is a wasteful number, since it uses less digits than its factorization.

21210343442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011272.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21210343442 its reverse (24434301212), we get a palindrome (45644644654).

The spelling of 21210343442 in words is "twenty-one billion, two hundred ten million, three hundred forty-three thousand, four hundred forty-two".