202120123405 has 8 divisors (see below), whose sum is σ = 243120264984. Its totient is φ = 161312020800.

The previous prime is 202120123399. The next prime is 202120123501. The reversal of 202120123405 is 504321021202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24591885124 + 177528238281 = 156818^2 + 421341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202120123405 - 2¹⁵ = 202120090637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48007426 + ... + 48011635.

It is an arithmetic number, because the mean of its divisors is an integer number (30390033123).

Almost surely, 2^202120123405 is an apocalyptic number.

It is an amenable number.

202120123405 is a deficient number, since it is larger than the sum of its proper divisors (41000141579).

202120123405 is an equidigital number, since it uses as much as digits as its factorization.

202120123405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96019487.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 202120123405 its reverse (504321021202), we get a palindrome (706441144607).

The spelling of 202120123405 in words is "two hundred two billion, one hundred twenty million, one hundred twenty-three thousand, four hundred five".