21222012010987 has 2 divisors, whose sum is σ = 21222012010988. Its totient is φ = 21222012010986.

The previous prime is 21222012010943. The next prime is 21222012011059. The reversal of 21222012010987 is 78901021022212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222012010987 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222012040987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611006005493 + 10611006005494.

It is an arithmetic number, because the mean of its divisors is an integer number (10611006005494).

Almost surely, 2^{21222012010987} is an apocalyptic number.

21222012010987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222012010987 is an equidigital number, since it uses as much as digits as its factorization.

21222012010987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 21222012010987 in words is "twenty-one trillion, two hundred twenty-two billion, twelve million, ten thousand, nine hundred eighty-seven".