2123405161 has 4 divisors (see below), whose sum is σ = 2123498052. Its totient is φ = 2123312272.

The previous prime is 2123405101. The next prime is 2123405177. The reversal of 2123405161 is 1615043212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 213715161 + 1909690000 = 14619^2 + 43700^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123405161 - 2¹⁹ = 2122880873 is a prime.

It is a super-2 number, since 2×2123405161² = 9017698955522871842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123405101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14511 + ... + 66763.

It is an arithmetic number, because the mean of its divisors is an integer number (530874513).

Almost surely, 2^2123405161 is an apocalyptic number.

It is an amenable number.

2123405161 is a deficient number, since it is larger than the sum of its proper divisors (92891).

2123405161 is an equidigital number, since it uses as much as digits as its factorization.

2123405161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92890.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2123405161 is about 46080.4205818480. The cubic root of 2123405161 is about 1285.3190850166.

Adding to 2123405161 its reverse (1615043212), we get a palindrome (3738448373).

The spelling of 2123405161 in words is "two billion, one hundred twenty-three million, four hundred five thousand, one hundred sixty-one".