2123156634 has 32 divisors (see below), whose sum is σ = 4664148480. Its totient is φ = 641318832.

The previous prime is 2123156621. The next prime is 2123156641. The reversal of 2123156634 is 4366513212.

It is a junction number, because it is equal to n+sod(n) for n = 2123156595 and 2123156604.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 402252 + ... + 407495.

It is an arithmetic number, because the mean of its divisors is an integer number (145754640).

Almost surely, 2^2123156634 is an apocalyptic number.

2123156634 is an abundant number, since it is smaller than the sum of its proper divisors (2540991846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2123156634 is a wasteful number, since it uses less digits than its factorization.

2123156634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809794.

The product of its digits is 25920, while the sum is 33.

The square root of 2123156634 is about 46077.7238370126. The cubic root of 2123156634 is about 1285.2689377398.

Adding to 2123156634 its reverse (4366513212), we get a palindrome (6489669846).

The spelling of 2123156634 in words is "two billion, one hundred twenty-three million, one hundred fifty-six thousand, six hundred thirty-four".