21221212120963 has 2 divisors, whose sum is σ = 21221212120964. Its totient is φ = 21221212120962.

The previous prime is 21221212120951. The next prime is 21221212121063. The reversal of 21221212120963 is 36902121212212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221212120963 - 2¹⁷ = 21221211989891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221212123963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610606060481 + 10610606060482.

It is an arithmetic number, because the mean of its divisors is an integer number (10610606060482).

Almost surely, 2^{21221212120963} is an apocalyptic number.

21221212120963 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221212120963 is an equidigital number, since it uses as much as digits as its factorization.

21221212120963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 21221212120963 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, nine hundred sixty-three".