2121001200123 has 16 divisors (see below), whose sum is σ = 3110338914816. Its totient is φ = 1277460623520.

The previous prime is 2121001200121. The next prime is 2121001200133. The reversal of 2121001200123 is 3210021001212.

It is not a de Polignac number, because 2121001200123 - 2¹ = 2121001200121 is a prime.

It is a super-3 number, since 3×2121001200123³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121001200121) 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, 578558233 + ... + 578561898.

It is an arithmetic number, because the mean of its divisors is an integer number (194396182176).

Almost surely, 2^{2121001200123} is an apocalyptic number.

2121001200123 is a deficient number, since it is larger than the sum of its proper divisors (989337714693).

2121001200123 is a wasteful number, since it uses less digits than its factorization.

2121001200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157120194.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 2121001200123 its reverse (3210021001212), we get a palindrome (5331022201335).

The spelling of 2121001200123 in words is "two trillion, one hundred twenty-one billion, one million, two hundred thousand, one hundred twenty-three".