21042342302 has 4 divisors (see below), whose sum is σ = 31563513456. Its totient is φ = 10521171150.

The previous prime is 21042342289. The next prime is 21042342341. The reversal of 21042342302 is 20324324012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5260585574 + ... + 5260585577.

It is an arithmetic number, because the mean of its divisors is an integer number (7890878364).

Almost surely, 2^21042342302 is an apocalyptic number.

21042342302 is a deficient number, since it is larger than the sum of its proper divisors (10521171154).

21042342302 is a wasteful number, since it uses less digits than its factorization.

21042342302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10521171153.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21042342302 its reverse (20324324012), we get a palindrome (41366666314).

The spelling of 21042342302 in words is "twenty-one billion, forty-two million, three hundred forty-two thousand, three hundred two".