211420225 has 6 divisors (see below), whose sum is σ = 262161110. Its totient is φ = 169136160.

The previous prime is 211420219. The next prime is 211420229. The reversal of 211420225 is 522024112.

It can be written as a sum of positive squares in 3 ways, for example, as 49392784 + 162027441 = 7028^2 + 12729^2 .

It is not a de Polignac number, because 211420225 - 2⁹ = 211419713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211420229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4228380 + ... + 4228429.

Almost surely, 2^211420225 is an apocalyptic number.

211420225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211420225 is a deficient number, since it is larger than the sum of its proper divisors (50740885).

211420225 is an equidigital number, since it uses as much as digits as its factorization.

211420225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8456819 (or 8456814 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 211420225 is about 14540.2965925733. The cubic root of 211420225 is about 595.7291393052.

Adding to 211420225 its reverse (522024112), we get a palindrome (733444337).

The spelling of 211420225 in words is "two hundred eleven million, four hundred twenty thousand, two hundred twenty-five".