2001220120323 has 48 divisors (see below), whose sum is σ = 3025208449536. Its totient is φ = 1273600558080.

The previous prime is 2001220120279. The next prime is 2001220120351. The reversal of 2001220120323 is 3230210221002.

2001220120323 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 220 + 120 + 323 = 666.

It is not a de Polignac number, because 2001220120323 - 2²¹ = 2001218023171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001220120296 and 2001220120305.

It is not an unprimeable number, because it can be changed into a prime (2001220100323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4427511 + ... + 4858527.

It is an arithmetic number, because the mean of its divisors is an integer number (63025176032).

Almost surely, 2^{2001220120323} is an apocalyptic number.

2001220120323 is a deficient number, since it is larger than the sum of its proper divisors (1023988329213).

2001220120323 is a wasteful number, since it uses less digits than its factorization.

2001220120323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431324 (or 431321 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 2001220120323 its reverse (3230210221002), we get a palindrome (5231430341325).

The spelling of 2001220120323 in words is "two trillion, one billion, two hundred twenty million, one hundred twenty thousand, three hundred twenty-three".