21213612324601 has 2 divisors, whose sum is σ = 21213612324602. Its totient is φ = 21213612324600.

The previous prime is 21213612324587. The next prime is 21213612324613. The reversal of 21213612324601 is 10642321631212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21190591848976 + 23020475625 = 4603324^2 + 151725^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213612324601 - 2⁹ = 21213612324089 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213612324661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606806162300 + 10606806162301.

It is an arithmetic number, because the mean of its divisors is an integer number (10606806162301).

Almost surely, 2^{21213612324601} is an apocalyptic number.

It is an amenable number.

21213612324601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213612324601 is an equidigital number, since it uses as much as digits as its factorization.

21213612324601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

Adding to 21213612324601 its reverse (10642321631212), we get a palindrome (31855933955813).

The spelling of 21213612324601 in words is "twenty-one trillion, two hundred thirteen billion, six hundred twelve million, three hundred twenty-four thousand, six hundred one".