21403242422234 has 32 divisors (see below), whose sum is σ = 33772018519440. Its totient is φ = 10158506265600.

The previous prime is 21403242422231. The next prime is 21403242422269. The reversal of 21403242422234 is 43222424230412.

It can be written as a sum of positive squares in 8 ways, for example, as 13942778404009 + 7460464018225 = 3734003^2 + 2731385^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21403242422194 and 21403242422203.

It is not an unprimeable number, because it can be changed into a prime (21403242422231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6245912 + ... + 9045324.

Almost surely, 2^{21403242422234} is an apocalyptic number.

21403242422234 is a deficient number, since it is larger than the sum of its proper divisors (12368776097206).

21403242422234 is a wasteful number, since it uses less digits than its factorization.

21403242422234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801666.

The product of its (nonzero) digits is 147456, while the sum is 35.

Adding to 21403242422234 its reverse (43222424230412), we get a palindrome (64625666652646).

The spelling of 21403242422234 in words is "twenty-one trillion, four hundred three billion, two hundred forty-two million, four hundred twenty-two thousand, two hundred thirty-four".