2001221123 has 8 divisors (see below), whose sum is σ = 2213899776. Its totient is φ = 1793667400.

The previous prime is 2001221119. The next prime is 2001221141. The reversal of 2001221123 is 3211221002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2001221123 - 2² = 2001221119 is a prime.

It is a super-2 number, since 2×2001221123² = 8009771966282762258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001221098 and 2001221107.

It is not an unprimeable number, because it can be changed into a prime (2001221323) 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, 1280411 + ... + 1281972.

It is an arithmetic number, because the mean of its divisors is an integer number (276737472).

Almost surely, 2^2001221123 is an apocalyptic number.

2001221123 is a deficient number, since it is larger than the sum of its proper divisors (212678653).

2001221123 is a wasteful number, since it uses less digits than its factorization.

2001221123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562465.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2001221123 is about 44735.0100368827. The cubic root of 2001221123 is about 1260.1774174879.

Adding to 2001221123 its reverse (3211221002), we get a palindrome (5212442125).

The spelling of 2001221123 in words is "two billion, one million, two hundred twenty-one thousand, one hundred twenty-three".