2001220023 has 16 divisors (see below), whose sum is σ = 3011241600. Its totient is φ = 1171037280.

The previous prime is 2001220019. The next prime is 2001220027. The reversal of 2001220023 is 3200221002.

It is an interprime number because it is at equal distance from previous prime (2001220019) and next prime (2001220027).

It is not a de Polignac number, because 2001220023 - 2² = 2001220019 is a prime.

It is a super-2 number, since 2×2001220023² = 8009763160912241058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001219990 and 2001220008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001220027) 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, 1044613 + ... + 1046526.

It is an arithmetic number, because the mean of its divisors is an integer number (188202600).

Almost surely, 2^2001220023 is an apocalyptic number.

2001220023 is a deficient number, since it is larger than the sum of its proper divisors (1010021577).

2001220023 is a wasteful number, since it uses less digits than its factorization.

2001220023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091182.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 2001220023 is about 44734.9977422599. The cubic root of 2001220023 is about 1260.1771865963.

Adding to 2001220023 its reverse (3200221002), we get a palindrome (5201441025).

The spelling of 2001220023 in words is "two billion, one million, two hundred twenty thousand, twenty-three".