21213602037413 has 2 divisors, whose sum is σ = 21213602037414. Its totient is φ = 21213602037412.

The previous prime is 21213602037401. The next prime is 21213602037421. The reversal of 21213602037413 is 31473020631212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20921274744484 + 292327292929 = 4573978^2 + 540673^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213602037413 - 2³⁰ = 21212528295589 is a prime.

It is a super-2 number, since 2×21213602037413² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213605037413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606801018706 + 10606801018707.

It is an arithmetic number, because the mean of its divisors is an integer number (10606801018707).

Almost surely, 2^{21213602037413} is an apocalyptic number.

It is an amenable number.

21213602037413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213602037413 is an equidigital number, since it uses as much as digits as its factorization.

21213602037413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 35.

Adding to 21213602037413 its reverse (31473020631212), we get a palindrome (52686622668625).

The spelling of 21213602037413 in words is "twenty-one trillion, two hundred thirteen billion, six hundred two million, thirty-seven thousand, four hundred thirteen".