2001221102123 has 8 divisors (see below), whose sum is σ = 2002563994848. Its totient is φ = 1999878375744.

The previous prime is 2001221102117. The next prime is 2001221102141. The reversal of 2001221102123 is 3212011221002.

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 2001221102123 - 2¹⁶ = 2001221036587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001221182123) 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, 32219165 + ... + 32281217.

It is an arithmetic number, because the mean of its divisors is an integer number (250320499356).

Almost surely, 2^{2001221102123} is an apocalyptic number.

2001221102123 is a deficient number, since it is larger than the sum of its proper divisors (1342892725).

2001221102123 is a wasteful number, since it uses less digits than its factorization.

2001221102123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83173.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 2001221102123 its reverse (3212011221002), we get a palindrome (5213232323125).

The spelling of 2001221102123 in words is "two trillion, one billion, two hundred twenty-one million, one hundred two thousand, one hundred twenty-three".