212521003 has 4 divisors (see below), whose sum is σ = 212954328. Its totient is φ = 212087680.

The previous prime is 212520977. The next prime is 212521037. The reversal of 212521003 is 300125212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212521003 is a prime.

It is a super-2 number, since 2×212521003² = 90330353432252018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212521073) 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, 215926 + ... + 216907.

It is an arithmetic number, because the mean of its divisors is an integer number (53238582).

Almost surely, 2^212521003 is an apocalyptic number.

212521003 is a deficient number, since it is larger than the sum of its proper divisors (433325).

212521003 is an equidigital number, since it uses as much as digits as its factorization.

212521003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433324.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 212521003 is about 14578.1001162703. The cubic root of 212521003 is about 596.7612554944.

Adding to 212521003 its reverse (300125212), we get a palindrome (512646215).

The spelling of 212521003 in words is "two hundred twelve million, five hundred twenty-one thousand, three".