2001321310123 has 8 divisors (see below), whose sum is σ = 2002121504000. Its totient is φ = 2000521283328.

The previous prime is 2001321310073. The next prime is 2001321310159. The reversal of 2001321310123 is 3210131231002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001321310123 - 2¹⁷ = 2001321179051 is a prime.

It is a super-2 number, since 2×2001321310123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001321310123.

It is not an unprimeable number, because it can be changed into a prime (2001321310423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27398053 + ... + 27471001.

It is an arithmetic number, because the mean of its divisors is an integer number (250265188000).

Almost surely, 2^{2001321310123} is an apocalyptic number.

2001321310123 is a deficient number, since it is larger than the sum of its proper divisors (800193877).

2001321310123 is an equidigital number, since it uses as much as digits as its factorization.

2001321310123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83541.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 2001321310123 its reverse (3210131231002), we get a palindrome (5211452541125).

The spelling of 2001321310123 in words is "two trillion, one billion, three hundred twenty-one million, three hundred ten thousand, one hundred twenty-three".