2123306501 has 4 divisors (see below), whose sum is σ = 2131568652. Its totient is φ = 2115044352.

The previous prime is 2123306491. The next prime is 2123306509. The reversal of 2123306501 is 1056033212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1603922401 + 519384100 = 40049^2 + 22790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123306501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123306509) 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, 4130690 + ... + 4131203.

It is an arithmetic number, because the mean of its divisors is an integer number (532892163).

Almost surely, 2^2123306501 is an apocalyptic number.

It is an amenable number.

2123306501 is a deficient number, since it is larger than the sum of its proper divisors (8262151).

2123306501 is an equidigital number, since it uses as much as digits as its factorization.

2123306501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262150.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 2123306501 is about 46079.3500496698. The cubic root of 2123306501 is about 1285.2991780692.

Adding to 2123306501 its reverse (1056033212), we get a palindrome (3179339713).

The spelling of 2123306501 in words is "two billion, one hundred twenty-three million, three hundred six thousand, five hundred one".