2623120021 has 4 divisors (see below), whose sum is σ = 2624102572. Its totient is φ = 2622137472.

The previous prime is 2623120007. The next prime is 2623120033. The reversal of 2623120021 is 1200213262.

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 943349796 + 1679770225 = 30714^2 + 40985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2623120021 - 2¹⁵ = 2623087253 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 (2623120001) 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, 487260 + ... + 492613.

It is an arithmetic number, because the mean of its divisors is an integer number (656025643).

Almost surely, 2^2623120021 is an apocalyptic number.

It is an amenable number.

2623120021 is a deficient number, since it is larger than the sum of its proper divisors (982551).

2623120021 is an equidigital number, since it uses as much as digits as its factorization.

2623120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982550.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2623120021 is about 51216.4038272896. The cubic root of 2623120021 is about 1379.1326940179.

Adding to 2623120021 its reverse (1200213262), we get a palindrome (3823333283).

The spelling of 2623120021 in words is "two billion, six hundred twenty-three million, one hundred twenty thousand, twenty-one".