211420525 has 12 divisors (see below), whose sum is σ = 262915092. Its totient is φ = 168650240.

The previous prime is 211420513. The next prime is 211420567. The reversal of 211420525 is 525024112.

It can be written as a sum of positive squares in 6 ways, for example, as 67081 + 211353444 = 259^2 + 14538^2 .

It is not a de Polignac number, because 211420525 - 2⁵ = 211420493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211420496 and 211420505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3154 + ... + 20803.

It is an arithmetic number, because the mean of its divisors is an integer number (21909591).

Almost surely, 2^211420525 is an apocalyptic number.

211420525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

211420525 is a deficient number, since it is larger than the sum of its proper divisors (51494567).

211420525 is a wasteful number, since it uses less digits than its factorization.

211420525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24320 (or 24315 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 211420525 is about 14540.3069087279. The cubic root of 211420525 is about 595.7294210800.

Adding to 211420525 its reverse (525024112), we get a palindrome (736444637).

The spelling of 211420525 in words is "two hundred eleven million, four hundred twenty thousand, five hundred twenty-five".