2001331222421 has 8 divisors (see below), whose sum is σ = 2065912468224. Its totient is φ = 1936751362560.

The previous prime is 2001331222411. The next prime is 2001331222453. The reversal of 2001331222421 is 1242221331002.

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 2001331222421 - 2¹⁰ = 2001331221397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001331222411) 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, 3147605 + ... + 3729621.

It is an arithmetic number, because the mean of its divisors is an integer number (258239058528).

Almost surely, 2^{2001331222421} is an apocalyptic number.

It is an amenable number.

2001331222421 is a deficient number, since it is larger than the sum of its proper divisors (64581245803).

2001331222421 is a wasteful number, since it uses less digits than its factorization.

2001331222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692971.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 2001331222421 its reverse (1242221331002), we get a palindrome (3243552553423).

The spelling of 2001331222421 in words is "two trillion, one billion, three hundred thirty-one million, two hundred twenty-two thousand, four hundred twenty-one".