21210220109963 has 2 divisors, whose sum is σ = 21210220109964. Its totient is φ = 21210220109962.

The previous prime is 21210220109951. The next prime is 21210220110059. The reversal of 21210220109963 is 36990102201212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210220109963 - 2²⁸ = 21209951674507 is a prime.

It is a super-2 number, since 2×21210220109963² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21210220102963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605110054981 + 10605110054982.

It is an arithmetic number, because the mean of its divisors is an integer number (10605110054982).

Almost surely, 2^{21210220109963} is an apocalyptic number.

21210220109963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210220109963 is an equidigital number, since it uses as much as digits as its factorization.

21210220109963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 21210220109963 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred nine thousand, nine hundred sixty-three".