21234510042 has 64 divisors (see below), whose sum is σ = 46677441024. Its totient is φ = 6413091840.

The previous prime is 21234510013. The next prime is 21234510079. The reversal of 21234510042 is 24001543212.

It is a junction number, because it is equal to n+sod(n) for n = 21234509994 and 21234510021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256128 + ... + 328740.

It is an arithmetic number, because the mean of its divisors is an integer number (729335016).

Almost surely, 2^21234510042 is an apocalyptic number.

21234510042 is an abundant number, since it is smaller than the sum of its proper divisors (25442930982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21234510042 is a wasteful number, since it uses less digits than its factorization.

21234510042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72743.

The product of its (nonzero) digits is 1920, while the sum is 24.

The spelling of 21234510042 in words is "twenty-one billion, two hundred thirty-four million, five hundred ten thousand, forty-two".