21151334432442 has 8 divisors (see below), whose sum is σ = 42302668864896. Its totient is φ = 7050444810812.

The previous prime is 21151334432419. The next prime is 21151334432443. The reversal of 21151334432442 is 24423443315112.

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

21151334432442 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21151334432442.

It is not an unprimeable number, because it can be changed into a prime (21151334432443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762611202698 + ... + 1762611202709.

It is an arithmetic number, because the mean of its divisors is an integer number (5287833608112).

Almost surely, 2^{21151334432442} is an apocalyptic number.

21151334432442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21151334432442 is a wasteful number, since it uses less digits than its factorization.

21151334432442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525222405412.

The product of its digits is 276480, while the sum is 39.

Adding to 21151334432442 its reverse (24423443315112), we get a palindrome (45574777747554).

The spelling of 21151334432442 in words is "twenty-one trillion, one hundred fifty-one billion, three hundred thirty-four million, four hundred thirty-two thousand, four hundred forty-two".