21230043353 has 4 divisors (see below), whose sum is σ = 21235018368. Its totient is φ = 21225068340.

The previous prime is 21230043347. The next prime is 21230043361. The reversal of 21230043353 is 35334003212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21230043353 - 2²² = 21225849049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230013353) 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, 2481101 + ... + 2489642.

It is an arithmetic number, because the mean of its divisors is an integer number (5308754592).

Almost surely, 2^21230043353 is an apocalyptic number.

It is an amenable number.

21230043353 is a deficient number, since it is larger than the sum of its proper divisors (4975015).

21230043353 is an equidigital number, since it uses as much as digits as its factorization.

21230043353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4975014.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21230043353 its reverse (35334003212), we get a palindrome (56564046565).

The spelling of 21230043353 in words is "twenty-one billion, two hundred thirty million, forty-three thousand, three hundred fifty-three".