2187220045 has 4 divisors (see below), whose sum is σ = 2624664060. Its totient is φ = 1749776032.

The previous prime is 2187220043. The next prime is 2187220103. The reversal of 2187220045 is 5400227812.

It is a happy number.

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 517517001 + 1669703044 = 22749^2 + 40862^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187220045 - 2¹ = 2187220043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2187219989 and 2187220016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2187220043) 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, 218722000 + ... + 218722009.

It is an arithmetic number, because the mean of its divisors is an integer number (656166015).

Almost surely, 2^2187220045 is an apocalyptic number.

It is an amenable number.

2187220045 is a deficient number, since it is larger than the sum of its proper divisors (437444015).

2187220045 is an equidigital number, since it uses as much as digits as its factorization.

2187220045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437444014.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 2187220045 is about 46767.7243940733. The cubic root of 2187220045 is about 1298.0681453979.

Adding to 2187220045 its reverse (5400227812), we get a palindrome (7587447857).

The spelling of 2187220045 in words is "two billion, one hundred eighty-seven million, two hundred twenty thousand, forty-five".