202120434423 has 24 divisors (see below), whose sum is σ = 310833287856. Its totient is φ = 126119980800.

The previous prime is 202120434409. The next prime is 202120434463. The reversal of 202120434423 is 324434021202.

202120434423 is a `hidden beast` number, since 2 + 0 + 2 + 1 + 204 + 34 + 423 = 666.

It is not a de Polignac number, because 202120434423 - 2⁴ = 202120434407 is a prime.

It is a super-2 number, since 2×202120434423² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202120434463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3621613 + ... + 3676998.

It is an arithmetic number, because the mean of its divisors is an integer number (12951386994).

Almost surely, 2^202120434423 is an apocalyptic number.

202120434423 is a deficient number, since it is larger than the sum of its proper divisors (108712853433).

202120434423 is a wasteful number, since it uses less digits than its factorization.

202120434423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7298815 (or 7298812 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 202120434423 its reverse (324434021202), we get a palindrome (526554455625).

The spelling of 202120434423 in words is "two hundred two billion, one hundred twenty million, four hundred thirty-four thousand, four hundred twenty-three".