21152221031442 has 8 divisors (see below), whose sum is σ = 42304442062896. Its totient is φ = 7050740343812.

The previous prime is 21152221031437. The next prime is 21152221031453. The reversal of 21152221031442 is 24413012225112.

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

21152221031442 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1762685085948 + ... + 1762685085959.

It is an arithmetic number, because the mean of its divisors is an integer number (5288055257862).

Almost surely, 2^{21152221031442} is an apocalyptic number.

21152221031442 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.

21152221031442 is a wasteful number, since it uses less digits than its factorization.

21152221031442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525370171912.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 21152221031442 its reverse (24413012225112), we get a palindrome (45565233256554).

The spelling of 21152221031442 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twenty-one million, thirty-one thousand, four hundred forty-two".