212303021 has 16 divisors (see below), whose sum is σ = 257647104. Its totient is φ = 170774784.

The previous prime is 212303011. The next prime is 212303029. The reversal of 212303021 is 120303212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212303021 - 2⁶ = 212302957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212302987 and 212303005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212303029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41996 + ... + 46778.

It is an arithmetic number, because the mean of its divisors is an integer number (16102944).

Almost surely, 2^212303021 is an apocalyptic number.

It is an amenable number.

212303021 is a deficient number, since it is larger than the sum of its proper divisors (45344083).

212303021 is a wasteful number, since it uses less digits than its factorization.

212303021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5180.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 212303021 is about 14570.6218467161. The cubic root of 212303021 is about 596.5571537651.

Adding to 212303021 its reverse (120303212), we get a palindrome (332606233).

The spelling of 212303021 in words is "two hundred twelve million, three hundred three thousand, twenty-one".