21422020042 has 8 divisors (see below), whose sum is σ = 34023208356. Its totient is φ = 10080950592.

The previous prime is 21422019967. The next prime is 21422020049. The reversal of 21422020042 is 24002022412.

It can be written as a sum of positive squares in 2 ways, for example, as 19709632881 + 1712387161 = 140391^2 + 41381^2 .

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 (21422020049) 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, 315029673 + ... + 315029740.

Almost surely, 2^21422020042 is an apocalyptic number.

21422020042 is a deficient number, since it is larger than the sum of its proper divisors (12601188314).

21422020042 is a wasteful number, since it uses less digits than its factorization.

21422020042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630059432.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21422020042 its reverse (24002022412), we get a palindrome (45424042454).

The spelling of 21422020042 in words is "twenty-one billion, four hundred twenty-two million, twenty thousand, forty-two".