2120154545 has 4 divisors (see below), whose sum is σ = 2544185460. Its totient is φ = 1696123632.

The previous prime is 2120154503. The next prime is 2120154571. The reversal of 2120154545 is 5454510212.

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 654489889 + 1465664656 = 25583^2 + 38284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120154545 - 2¹² = 2120150449 is a prime.

It is a Curzon 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, 212015450 + ... + 212015459.

It is an arithmetic number, because the mean of its divisors is an integer number (636046365).

Almost surely, 2^2120154545 is an apocalyptic number.

It is an amenable number.

2120154545 is a deficient number, since it is larger than the sum of its proper divisors (424030915).

2120154545 is an equidigital number, since it uses as much as digits as its factorization.

2120154545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424030914.

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 2120154545 is about 46045.1359537574. The cubic root of 2120154545 is about 1284.6628728973.

Adding to 2120154545 its reverse (5454510212), we get a palindrome (7574664757).

The spelling of 2120154545 in words is "two billion, one hundred twenty million, one hundred fifty-four thousand, five hundred forty-five".