21043211421242 has 8 divisors (see below), whose sum is σ = 31997211887316. Its totient is φ = 10377474125472.

The previous prime is 21043211421241. The next prime is 21043211421293. The reversal of 21043211421242 is 24212411234012.

It can be written as a sum of positive squares in 2 ways, for example, as 20298457955161 + 744753466081 = 4505381^2 + 862991^2 .

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 (21043211421241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72065792393 + ... + 72065792684.

Almost surely, 2^{21043211421242} is an apocalyptic number.

21043211421242 is a deficient number, since it is larger than the sum of its proper divisors (10954000466074).

21043211421242 is a wasteful number, since it uses less digits than its factorization.

21043211421242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144131585152.

The product of its (nonzero) digits is 6144, while the sum is 29.

Adding to 21043211421242 its reverse (24212411234012), we get a palindrome (45255622655254).

The spelling of 21043211421242 in words is "twenty-one trillion, forty-three billion, two hundred eleven million, four hundred twenty-one thousand, two hundred forty-two".