2001221019 has 16 divisors (see below), whose sum is σ = 3388311040. Its totient is φ = 1143554760.

The previous prime is 2001220987. The next prime is 2001221039. The reversal of 2001221019 is 9101221002.

It is not a de Polignac number, because 2001221019 - 2⁵ = 2001220987 is a prime.

It is a super-2 number, since 2×2001221019² = 8009771133774796722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001220992 and 2001221010.

It is not an unprimeable number, because it can be changed into a prime (2001221039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5294047 + ... + 5294424.

It is an arithmetic number, because the mean of its divisors is an integer number (211769440).

Almost surely, 2^2001221019 is an apocalyptic number.

2001221019 is a deficient number, since it is larger than the sum of its proper divisors (1387090021).

2001221019 is a wasteful number, since it uses less digits than its factorization.

2001221019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10588487 (or 10588481 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 2001221019 is about 44735.0088744822. The cubic root of 2001221019 is about 1260.1773956582.

The spelling of 2001221019 in words is "two billion, one million, two hundred twenty-one thousand, nineteen".