2121420012123 has 32 divisors (see below), whose sum is σ = 2956144149504. Its totient is φ = 1350681360512.

The previous prime is 2121420012113. The next prime is 2121420012139. The reversal of 2121420012123 is 3212100241212.

It is a happy number.

It is not a de Polignac number, because 2121420012123 - 2²⁶ = 2121352903259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121420012123.

It is not an unprimeable number, because it can be changed into a prime (2121420012113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137899090 + ... + 137914472.

It is an arithmetic number, because the mean of its divisors is an integer number (92379504672).

Almost surely, 2^{2121420012123} is an apocalyptic number.

2121420012123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2121420012123 is a deficient number, since it is larger than the sum of its proper divisors (834724137381).

2121420012123 is a wasteful number, since it uses less digits than its factorization.

2121420012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18395.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 2121420012123 its reverse (3212100241212), we get a palindrome (5333520253335).

The spelling of 2121420012123 in words is "two trillion, one hundred twenty-one billion, four hundred twenty million, twelve thousand, one hundred twenty-three".