21220022009987 has 2 divisors, whose sum is σ = 21220022009988. Its totient is φ = 21220022009986.

The previous prime is 21220022009959. The next prime is 21220022010029. The reversal of 21220022009987 is 78990022002212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220022009987 - 2¹² = 21220022005891 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220022009387) 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, 10610011004993 + 10610011004994.

It is an arithmetic number, because the mean of its divisors is an integer number (10610011004994).

Almost surely, 2^{21220022009987} is an apocalyptic number.

21220022009987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220022009987 is an equidigital number, since it uses as much as digits as its factorization.

21220022009987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21220022009987 in words is "twenty-one trillion, two hundred twenty billion, twenty-two million, nine thousand, nine hundred eighty-seven".