21234342021442 has 16 divisors (see below), whose sum is σ = 35223092870112. Its totient is φ = 9519754828320.

The previous prime is 21234342021359. The next prime is 21234342021467. The reversal of 21234342021442 is 24412024343212.

It is a junction number, because it is equal to n+sod(n) for n = 21234342021398 and 21234342021407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6610939248 + ... + 6610942459.

It is an arithmetic number, because the mean of its divisors is an integer number (2201443304382).

Almost surely, 2^{21234342021442} is an apocalyptic number.

21234342021442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21234342021442 is a deficient number, since it is larger than the sum of its proper divisors (13988750848670).

21234342021442 is a wasteful number, since it uses less digits than its factorization.

21234342021442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13221881793.

The product of its (nonzero) digits is 73728, while the sum is 34.

Adding to 21234342021442 its reverse (24412024343212), we get a palindrome (45646366364654).

The spelling of 21234342021442 in words is "twenty-one trillion, two hundred thirty-four billion, three hundred forty-two million, twenty-one thousand, four hundred forty-two".