211225345 has 4 divisors (see below), whose sum is σ = 253470420. Its totient is φ = 168980272.

The previous prime is 211225327. The next prime is 211225387. The reversal of 211225345 is 543522112.

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 89189136 + 122036209 = 9444^2 + 11047^2 .

It is a cyclic number.

It is not a de Polignac number, because 211225345 - 2²³ = 202836737 is a prime.

It is a super-2 number, since 2×211225345² = 89232292740738050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21122530 + ... + 21122539.

It is an arithmetic number, because the mean of its divisors is an integer number (63367605).

Almost surely, 2^211225345 is an apocalyptic number.

It is an amenable number.

211225345 is a deficient number, since it is larger than the sum of its proper divisors (42245075).

211225345 is an equidigital number, since it uses as much as digits as its factorization.

211225345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42245074.

The product of its digits is 2400, while the sum is 25.

The square root of 211225345 is about 14533.5936712157. The cubic root of 211225345 is about 595.5460420574.

Adding to 211225345 its reverse (543522112), we get a palindrome (754747457).

The spelling of 211225345 in words is "two hundred eleven million, two hundred twenty-five thousand, three hundred forty-five".