21234201353 has 4 divisors (see below), whose sum is σ = 21234499860. Its totient is φ = 21233902848.

The previous prime is 21234201349. The next prime is 21234201413. The reversal of 21234201353 is 35310243212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 17164144144 + 4070057209 = 131012^2 + 63797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234201353 - 2² = 21234201349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234201323) 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, 26201 + ... + 207737.

It is an arithmetic number, because the mean of its divisors is an integer number (5308624965).

Almost surely, 2^21234201353 is an apocalyptic number.

It is an amenable number.

21234201353 is a deficient number, since it is larger than the sum of its proper divisors (298507).

21234201353 is a wasteful number, since it uses less digits than its factorization.

21234201353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298506.

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21234201353 its reverse (35310243212), we get a palindrome (56544444565).

The spelling of 21234201353 in words is "twenty-one billion, two hundred thirty-four million, two hundred one thousand, three hundred fifty-three".