21054421442 has 8 divisors (see below), whose sum is σ = 31830306816. Its totient is φ = 10444319172.

The previous prime is 21054421441. The next prime is 21054421447. The reversal of 21054421442 is 24412445012.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21054421441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41445458 + ... + 41445965.

It is an arithmetic number, because the mean of its divisors is an integer number (3978788352).

Almost surely, 2^21054421442 is an apocalyptic number.

21054421442 is a deficient number, since it is larger than the sum of its proper divisors (10775885374).

21054421442 is a wasteful number, since it uses less digits than its factorization.

21054421442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82891552.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 21054421442 its reverse (24412445012), we get a palindrome (45466866454).

The spelling of 21054421442 in words is "twenty-one billion, fifty-four million, four hundred twenty-one thousand, four hundred forty-two".