21230203342 has 4 divisors (see below), whose sum is σ = 31845305016. Its totient is φ = 10615101670.

The previous prime is 21230203331. The next prime is 21230203367. The reversal of 21230203342 is 24330203212.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5307550834 + ... + 5307550837.

It is an arithmetic number, because the mean of its divisors is an integer number (7961326254).

Almost surely, 2^21230203342 is an apocalyptic number.

21230203342 is a deficient number, since it is larger than the sum of its proper divisors (10615101674).

21230203342 is a wasteful number, since it uses less digits than its factorization.

21230203342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10615101673.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21230203342 its reverse (24330203212), we get a palindrome (45560406554).

The spelling of 21230203342 in words is "twenty-one billion, two hundred thirty million, two hundred three thousand, three hundred forty-two".