2121001110123 has 16 divisors (see below), whose sum is σ = 3232023029760. Its totient is φ = 1211992632576.

The previous prime is 2121001110103. The next prime is 2121001110149. The reversal of 2121001110123 is 3210111001212.

It is not a de Polignac number, because 2121001110123 - 2⁹ = 2121001109611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121001110103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4667643 + ... + 5101851.

It is an arithmetic number, because the mean of its divisors is an integer number (202001439360).

Almost surely, 2^{2121001110123} is an apocalyptic number.

2121001110123 is a deficient number, since it is larger than the sum of its proper divisors (1111021919637).

2121001110123 is a wasteful number, since it uses less digits than its factorization.

2121001110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666826.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 2121001110123 its reverse (3210111001212), we get a palindrome (5331112111335).

The spelling of 2121001110123 in words is "two trillion, one hundred twenty-one billion, one million, one hundred ten thousand, one hundred twenty-three".