21353342303 has 32 divisors (see below), whose sum is σ = 23431902912. Its totient is φ = 19382272000.

The previous prime is 21353342281. The next prime is 21353342359. The reversal of 21353342303 is 30324335312.

It is a cyclic number.

It is not a de Polignac number, because 21353342303 - 2⁶ = 21353342239 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 (21353344303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13336703 + ... + 13338303.

It is an arithmetic number, because the mean of its divisors is an integer number (732246966).

Almost surely, 2^21353342303 is an apocalyptic number.

21353342303 is a deficient number, since it is larger than the sum of its proper divisors (2078560609).

21353342303 is a wasteful number, since it uses less digits than its factorization.

21353342303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915.

The product of its (nonzero) digits is 19440, while the sum is 29.

Adding to 21353342303 its reverse (30324335312), we get a palindrome (51677677615).

The spelling of 21353342303 in words is "twenty-one billion, three hundred fifty-three million, three hundred forty-two thousand, three hundred three".