21124231434442 has 8 divisors (see below), whose sum is σ = 31687082582436. Its totient is φ = 10561870573632.

The previous prime is 21124231434421. The next prime is 21124231434443. The reversal of 21124231434442 is 24443413242112.

It can be written as a sum of positive squares in 2 ways, for example, as 20828827227321 + 295404207121 = 4563861^2 + 543511^2 .

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 (21124231434443) by changing a digit.

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, 122464063 + ... + 122636434.

Almost surely, 2^{21124231434442} is an apocalyptic number.

21124231434442 is a deficient number, since it is larger than the sum of its proper divisors (10562851147994).

21124231434442 is a wasteful number, since it uses less digits than its factorization.

21124231434442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245143592.

The product of its digits is 147456, while the sum is 37.

Adding to 21124231434442 its reverse (24443413242112), we get a palindrome (45567644676554).

The spelling of 21124231434442 in words is "twenty-one trillion, one hundred twenty-four billion, two hundred thirty-one million, four hundred thirty-four thousand, four hundred forty-two".