21243234142042 has 32 divisors (see below), whose sum is σ = 34869411878400. Its totient is φ = 9626104931520.

The previous prime is 21243234142033. The next prime is 21243234142087. The reversal of 21243234142042 is 24024143234212.

It is a junction number, because it is equal to n+sod(n) for n = 21243234141989 and 21243234142007.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19146648 + ... + 20225740.

It is an arithmetic number, because the mean of its divisors is an integer number (1089669121200).

Almost surely, 2^{21243234142042} is an apocalyptic number.

21243234142042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21243234142042 is a deficient number, since it is larger than the sum of its proper divisors (13626177736358).

21243234142042 is a wasteful number, since it uses less digits than its factorization.

21243234142042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081878.

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

Adding to 21243234142042 its reverse (24024143234212), we get a palindrome (45267377376254).

The spelling of 21243234142042 in words is "twenty-one trillion, two hundred forty-three billion, two hundred thirty-four million, one hundred forty-two thousand, forty-two".