1999100220001 has 4 divisors (see below), whose sum is σ = 2063587323904. Its totient is φ = 1934613116100.

The previous prime is 1999100219999. The next prime is 1999100220011. The reversal of 1999100220001 is 1000220019991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1999100220001 - 2¹ = 1999100219999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999100220011) 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 in 3 ways as a sum of consecutive naturals, for example, 32243551905 + ... + 32243551966.

It is an arithmetic number, because the mean of its divisors is an integer number (515896830976).

Almost surely, 2^{1999100220001} is an apocalyptic number.

It is an amenable number.

1999100220001 is a deficient number, since it is larger than the sum of its proper divisors (64487103903).

1999100220001 is an equidigital number, since it uses as much as digits as its factorization.

1999100220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64487103902.

The product of its (nonzero) digits is 2916, while the sum is 34.

Adding to 1999100220001 its reverse (1000220019991), we get a palindrome (2999320239992).

The spelling of 1999100220001 in words is "one trillion, nine hundred ninety-nine billion, one hundred million, two hundred twenty thousand, one".