2123154445 has 4 divisors (see below), whose sum is σ = 2547785340. Its totient is φ = 1698523552.

The previous prime is 2123154427. The next prime is 2123154457. The reversal of 2123154445 is 5444513212.

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 753118249 + 1370036196 = 27443^2 + 37014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123154445 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212315440 + ... + 212315449.

It is an arithmetic number, because the mean of its divisors is an integer number (636946335).

Almost surely, 2^2123154445 is an apocalyptic number.

It is an amenable number.

2123154445 is a deficient number, since it is larger than the sum of its proper divisors (424630895).

2123154445 is an equidigital number, since it uses as much as digits as its factorization.

2123154445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424630894.

The product of its digits is 19200, while the sum is 31.

The square root of 2123154445 is about 46077.7000836630. The cubic root of 2123154445 is about 1285.2684960304.

Adding to 2123154445 its reverse (5444513212), we get a palindrome (7567667657).

The spelling of 2123154445 in words is "two billion, one hundred twenty-three million, one hundred fifty-four thousand, four hundred forty-five".