21010042342 has 8 divisors (see below), whose sum is σ = 31689180432. Its totient is φ = 10446982200.

The previous prime is 21010042309. The next prime is 21010042343. The reversal of 21010042342 is 24324001012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010042343) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 29019034 + ... + 29019757.

It is an arithmetic number, because the mean of its divisors is an integer number (3961147554).

Almost surely, 2^21010042342 is an apocalyptic number.

21010042342 is a deficient number, since it is larger than the sum of its proper divisors (10679138090).

21010042342 is a wasteful number, since it uses less digits than its factorization.

21010042342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58038974.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21010042342 its reverse (24324001012), we get a palindrome (45334043354).

The spelling of 21010042342 in words is "twenty-one billion, ten million, forty-two thousand, three hundred forty-two".