21320303042 has 4 divisors (see below), whose sum is σ = 31980454566. Its totient is φ = 10660151520.

The previous prime is 21320303029. The next prime is 21320303051. The reversal of 21320303042 is 24030302312.

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

It can be written as a sum of positive squares in only one way, i.e., 21304613521 + 15689521 = 145961^2 + 3961^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330075759 + ... + 5330075762.

Almost surely, 2^21320303042 is an apocalyptic number.

21320303042 is a deficient number, since it is larger than the sum of its proper divisors (10660151524).

21320303042 is a wasteful number, since it uses less digits than its factorization.

21320303042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660151523.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21320303042 its reverse (24030302312), we get a palindrome (45350605354).

The spelling of 21320303042 in words is "twenty-one billion, three hundred twenty million, three hundred three thousand, forty-two".