21345350303 has 4 divisors (see below), whose sum is σ = 21363425448. Its totient is φ = 21327275160.

The previous prime is 21345350287. The next prime is 21345350311. The reversal of 21345350303 is 30305354312.

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

It is a cyclic number.

It is not a de Polignac number, because 21345350303 - 2⁴ = 21345350287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345355303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9035801 + ... + 9038162.

It is an arithmetic number, because the mean of its divisors is an integer number (5340856362).

Almost surely, 2^21345350303 is an apocalyptic number.

21345350303 is a deficient number, since it is larger than the sum of its proper divisors (18075145).

21345350303 is a wasteful number, since it uses less digits than its factorization.

21345350303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18075144.

The product of its (nonzero) digits is 16200, while the sum is 29.

The spelling of 21345350303 in words is "twenty-one billion, three hundred forty-five million, three hundred fifty thousand, three hundred three".