217422045 has 12 divisors (see below), whose sum is σ = 376864956. Its totient is φ = 115958400.

The previous prime is 217422043. The next prime is 217422097. The reversal of 217422045 is 540224712.

It can be written as a sum of positive squares in 2 ways, for example, as 73925604 + 143496441 = 8598^2 + 11979^2 .

It is not a de Polignac number, because 217422045 - 2¹ = 217422043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217422041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2415756 + ... + 2415845.

It is an arithmetic number, because the mean of its divisors is an integer number (31405413).

Almost surely, 2^217422045 is an apocalyptic number.

It is an amenable number.

217422045 is a deficient number, since it is larger than the sum of its proper divisors (159442911).

217422045 is a wasteful number, since it uses less digits than its factorization.

217422045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4831612 (or 4831609 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 217422045 is about 14745.2380448740. The cubic root of 217422045 is about 601.3138293210.

Adding to 217422045 its reverse (540224712), we get a palindrome (757646757).

The spelling of 217422045 in words is "two hundred seventeen million, four hundred twenty-two thousand, forty-five".