212503457 has 4 divisors (see below), whose sum is σ = 214453140. Its totient is φ = 210553776.

The previous prime is 212503453. The next prime is 212503471. The reversal of 212503457 is 754305212.

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 150896656 + 61606801 = 12284^2 + 7849^2 .

It is a cyclic number.

It is not a de Polignac number, because 212503457 - 2² = 212503453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212503453) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 974678 + ... + 974895.

It is an arithmetic number, because the mean of its divisors is an integer number (53613285).

Almost surely, 2^212503457 is an apocalyptic number.

It is an amenable number.

212503457 is a deficient number, since it is larger than the sum of its proper divisors (1949683).

212503457 is a wasteful number, since it uses less digits than its factorization.

212503457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1949682.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 212503457 is about 14577.4983107528. The cubic root of 212503457 is about 596.7448319237.

Adding to 212503457 its reverse (754305212), we get a palindrome (966808669).

The spelling of 212503457 in words is "two hundred twelve million, five hundred three thousand, four hundred fifty-seven".