2145221545 has 16 divisors (see below), whose sum is σ = 2659783680. Its totient is φ = 1659268800.

The previous prime is 2145221521. The next prime is 2145221563. The reversal of 2145221545 is 5451225412.

It is not a de Polignac number, because 2145221545 - 2⁵ = 2145221513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177196 + ... + 188914.

It is an arithmetic number, because the mean of its divisors is an integer number (166236480).

Almost surely, 2^2145221545 is an apocalyptic number.

It is an amenable number.

2145221545 is a deficient number, since it is larger than the sum of its proper divisors (514562135).

2145221545 is a wasteful number, since it uses less digits than its factorization.

2145221545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936.

The product of its digits is 16000, while the sum is 31.

The square root of 2145221545 is about 46316.5364097964. The cubic root of 2145221545 is about 1289.7059893223.

Adding to 2145221545 its reverse (5451225412), we get a palindrome (7596446957).

The spelling of 2145221545 in words is "two billion, one hundred forty-five million, two hundred twenty-one thousand, five hundred forty-five".