21321201353 has 2 divisors, whose sum is σ = 21321201354. Its totient is φ = 21321201352.

The previous prime is 21321201311. The next prime is 21321201373. The reversal of 21321201353 is 35310212312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19306268809 + 2014932544 = 138947^2 + 44888^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321201353 - 2⁶ = 21321201289 is a prime.

It is not a weakly prime, because it can be changed into another prime (21321201373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660600676 + 10660600677.

It is an arithmetic number, because the mean of its divisors is an integer number (10660600677).

Almost surely, 2^21321201353 is an apocalyptic number.

It is an amenable number.

21321201353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321201353 is an equidigital number, since it uses as much as digits as its factorization.

21321201353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 21321201353 its reverse (35310212312), we get a palindrome (56631413665).

The spelling of 21321201353 in words is "twenty-one billion, three hundred twenty-one million, two hundred one thousand, three hundred fifty-three".