21213555613603 has 2 divisors, whose sum is σ = 21213555613604. Its totient is φ = 21213555613602.

The previous prime is 21213555613553. The next prime is 21213555613651. The reversal of 21213555613603 is 30631655531212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21213555613603 - 2⁴¹ = 19014532358051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21213555613603.

It is not a weakly prime, because it can be changed into another prime (21213555619603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606777806801 + 10606777806802.

It is an arithmetic number, because the mean of its divisors is an integer number (10606777806802).

Almost surely, 2^{21213555613603} is an apocalyptic number.

21213555613603 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213555613603 is an equidigital number, since it uses as much as digits as its factorization.

21213555613603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 21213555613603 in words is "twenty-one trillion, two hundred thirteen billion, five hundred fifty-five million, six hundred thirteen thousand, six hundred three".