202121044123 has 4 divisors (see below), whose sum is σ = 202133199448. Its totient is φ = 202108888800.

The previous prime is 202121044121. The next prime is 202121044127. The reversal of 202121044123 is 321440121202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321440121202 = 2 ⋅160720060601.

It is a cyclic number.

It is not a de Polignac number, because 202121044123 - 2¹ = 202121044121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202121044094 and 202121044103.

It is not an unprimeable number, because it can be changed into a prime (202121044121) 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, 6052686 + ... + 6085987.

It is an arithmetic number, because the mean of its divisors is an integer number (50533299862).

Almost surely, 2^202121044123 is an apocalyptic number.

202121044123 is a deficient number, since it is larger than the sum of its proper divisors (12155325).

202121044123 is a wasteful number, since it uses less digits than its factorization.

202121044123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12155324.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 202121044123 its reverse (321440121202), we get a palindrome (523561165325).

The spelling of 202121044123 in words is "two hundred two billion, one hundred twenty-one million, forty-four thousand, one hundred twenty-three".