2121200101123 has 4 divisors (see below), whose sum is σ = 2121226562320. Its totient is φ = 2121173639928.

The previous prime is 2121200101109. The next prime is 2121200101147. The reversal of 2121200101123 is 3211010021212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2121200101123 - 2²⁵ = 2121166546691 is a prime.

It is a super-2 number, since 2×2121200101123² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121200101097 and 2121200101106.

It is not an unprimeable number, because it can be changed into a prime (2121200101193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13109988 + ... + 13270801.

It is an arithmetic number, because the mean of its divisors is an integer number (530306640580).

Almost surely, 2^{2121200101123} is an apocalyptic number.

2121200101123 is a deficient number, since it is larger than the sum of its proper divisors (26461197).

2121200101123 is an equidigital number, since it uses as much as digits as its factorization.

2121200101123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26461196.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2121200101123 its reverse (3211010021212), we get a palindrome (5332210122335).

The spelling of 2121200101123 in words is "two trillion, one hundred twenty-one billion, two hundred million, one hundred one thousand, one hundred twenty-three".