20421121303442 has 8 divisors (see below), whose sum is σ = 30632578848396. Its totient is φ = 10210261687312.

The previous prime is 20421121303411. The next prime is 20421121303483. The reversal of 20421121303442 is 24430312112402.

It can be written as a sum of positive squares in 2 ways, for example, as 19995483800161 + 425637503281 = 4471631^2 + 652409^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149396813 + ... + 149533440.

Almost surely, 2^{20421121303442} is an apocalyptic number.

20421121303442 is a deficient number, since it is larger than the sum of its proper divisors (10211457544954).

20421121303442 is a wasteful number, since it uses less digits than its factorization.

20421121303442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298964412.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 20421121303442 its reverse (24430312112402), we get a palindrome (44851433415844).

The spelling of 20421121303442 in words is "twenty trillion, four hundred twenty-one billion, one hundred twenty-one million, three hundred three thousand, four hundred forty-two".