2001121231 has 8 divisors (see below), whose sum is σ = 2035933200. Its totient is φ = 1966339200.

The previous prime is 2001121223. The next prime is 2001121259. The reversal of 2001121231 is 1321211002.

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 2001121231 - 2³ = 2001121223 is a prime.

It is a super-2 number, since 2×2001121231² = 8008972362317910722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121261) 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, 159205 + ... + 171313.

It is an arithmetic number, because the mean of its divisors is an integer number (254491650).

Almost surely, 2^2001121231 is an apocalyptic number.

2001121231 is a deficient number, since it is larger than the sum of its proper divisors (34811969).

2001121231 is a wasteful number, since it uses less digits than its factorization.

2001121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14969.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2001121231 is about 44733.8935372275. The cubic root of 2001121231 is about 1260.1564496672.

Adding to 2001121231 its reverse (1321211002), we get a palindrome (3322332233).

The spelling of 2001121231 in words is "two billion, one million, one hundred twenty-one thousand, two hundred thirty-one".