21321230101 has 2 divisors, whose sum is σ = 21321230102. Its totient is φ = 21321230100.

The previous prime is 21321230089. The next prime is 21321230111. The reversal of 21321230101 is 10103212312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16550565201 + 4770664900 = 128649^2 + 69070^2 .

It is a cyclic number.

It is not a de Polignac number, because 21321230101 - 2¹⁵ = 21321197333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321230111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660615050 + 10660615051.

It is an arithmetic number, because the mean of its divisors is an integer number (10660615051).

Almost surely, 2^21321230101 is an apocalyptic number.

It is an amenable number.

21321230101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321230101 is an equidigital number, since it uses as much as digits as its factorization.

21321230101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21321230101 its reverse (10103212312), we get a palindrome (31424442413).

The spelling of 21321230101 in words is "twenty-one billion, three hundred twenty-one million, two hundred thirty thousand, one hundred one".