212003021 has 8 divisors (see below), whose sum is σ = 223453080. Its totient is φ = 200828992.

The previous prime is 212003009. The next prime is 212003027. The reversal of 212003021 is 120300212.

It is a happy number.

212003021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 85192900 + 126810121 = 9230^2 + 11261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212003021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212002993 and 212003011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212003027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67430 + ... + 70503.

It is an arithmetic number, because the mean of its divisors is an integer number (27931635).

Almost surely, 2^212003021 is an apocalyptic number.

It is an amenable number.

212003021 is a deficient number, since it is larger than the sum of its proper divisors (11450059).

212003021 is a wasteful number, since it uses less digits than its factorization.

212003021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138015.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 212003021 is about 14560.3235197574. The cubic root of 212003021 is about 596.2760280586.

Adding to 212003021 its reverse (120300212), we get a palindrome (332303233).

The spelling of 212003021 in words is "two hundred twelve million, three thousand, twenty-one".