221020001999 has 2 divisors, whose sum is σ = 221020002000. Its totient is φ = 221020001998.

The previous prime is 221020001989. The next prime is 221020002019. The reversal of 221020001999 is 999100020122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221020001999 - 2¹⁶ = 221019936463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020001989) 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, 110510000999 + 110510001000.

It is an arithmetic number, because the mean of its divisors is an integer number (110510001000).

Almost surely, 2^221020001999 is an apocalyptic number.

221020001999 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020001999 is an equidigital number, since it uses as much as digits as its factorization.

221020001999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 221020001999 in words is "two hundred twenty-one billion, twenty million, one thousand, nine hundred ninety-nine".