202120001123 has 4 divisors (see below), whose sum is σ = 202121517960. Its totient is φ = 202118484288.

The previous prime is 202120001117. The next prime is 202120001159. The reversal of 202120001123 is 321100021202.

It is a happy number.

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 202120001123 - 2⁴ = 202120001107 is a prime.

It is a super-2 number, since 2×202120001123² (a number of 23 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 = 202120001098 and 202120001107.

It is not an unprimeable number, because it can be changed into a prime (202120001183) 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, 536993 + ... + 832226.

It is an arithmetic number, because the mean of its divisors is an integer number (50530379490).

Almost surely, 2^202120001123 is an apocalyptic number.

202120001123 is a deficient number, since it is larger than the sum of its proper divisors (1516837).

202120001123 is a wasteful number, since it uses less digits than its factorization.

202120001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1516836.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 202120001123 its reverse (321100021202), we get a palindrome (523220022325).

The spelling of 202120001123 in words is "two hundred two billion, one hundred twenty million, one thousand, one hundred twenty-three".