21221355320063 has 2 divisors, whose sum is σ = 21221355320064. Its totient is φ = 21221355320062.

The previous prime is 21221355320047. The next prime is 21221355320071. The reversal of 21221355320063 is 36002355312212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221355320063 - 2⁴ = 21221355320047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221355320003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610677660031 + 10610677660032.

It is an arithmetic number, because the mean of its divisors is an integer number (10610677660032).

Almost surely, 2^{21221355320063} is an apocalyptic number.

21221355320063 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221355320063 is an equidigital number, since it uses as much as digits as its factorization.

21221355320063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 21221355320063 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, sixty-three".