21202312303 has 4 divisors (see below), whose sum is σ = 21214367680. Its totient is φ = 21190256928.

The previous prime is 21202312277. The next prime is 21202312309. The reversal of 21202312303 is 30321320212.

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 21202312303 - 2²¹ = 21200215151 is a prime.

It is a super-3 number, since 3×21202312303³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202312309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6025050 + ... + 6028567.

It is an arithmetic number, because the mean of its divisors is an integer number (5303591920).

Almost surely, 2^21202312303 is an apocalyptic number.

21202312303 is a deficient number, since it is larger than the sum of its proper divisors (12055377).

21202312303 is a wasteful number, since it uses less digits than its factorization.

21202312303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12055376.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21202312303 its reverse (30321320212), we get a palindrome (51523632515).

The spelling of 21202312303 in words is "twenty-one billion, two hundred two million, three hundred twelve thousand, three hundred three".