21230302355 has 16 divisors (see below), whose sum is σ = 27029964384. Its totient is φ = 15952581120.

The previous prime is 21230302351. The next prime is 21230302361. The reversal of 21230302355 is 55320303212.

It is not a de Polignac number, because 21230302355 - 2² = 21230302351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230302351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212612 + ... + 296081.

It is an arithmetic number, because the mean of its divisors is an integer number (1689372774).

Almost surely, 2^21230302355 is an apocalyptic number.

21230302355 is a deficient number, since it is larger than the sum of its proper divisors (5799662029).

21230302355 is a wasteful number, since it uses less digits than its factorization.

21230302355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509206.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21230302355 its reverse (55320303212), we get a palindrome (76550605567).

The spelling of 21230302355 in words is "twenty-one billion, two hundred thirty million, three hundred two thousand, three hundred fifty-five".