21621212230313 has 2 divisors, whose sum is σ = 21621212230314. Its totient is φ = 21621212230312.

The previous prime is 21621212230291. The next prime is 21621212230363. The reversal of 21621212230313 is 31303221212612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21597239282089 + 23972948224 = 4647283^2 + 154832^2 .

It is a cyclic number.

It is not a de Polignac number, because 21621212230313 - 2¹² = 21621212226217 is a prime.

It is not a weakly prime, because it can be changed into another prime (21621212230363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810606115156 + 10810606115157.

It is an arithmetic number, because the mean of its divisors is an integer number (10810606115157).

Almost surely, 2^{21621212230313} is an apocalyptic number.

It is an amenable number.

21621212230313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21621212230313 is an equidigital number, since it uses as much as digits as its factorization.

21621212230313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 21621212230313 its reverse (31303221212612), we get a palindrome (52924433442925).

The spelling of 21621212230313 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred twelve million, two hundred thirty thousand, three hundred thirteen".