210214021 has 4 divisors (see below), whose sum is σ = 212142700. Its totient is φ = 208285344.

The previous prime is 210214003. The next prime is 210214049. The reversal of 210214021 is 120412012.

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 188925025 + 21288996 = 13745^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 210214021 - 2⁵ = 210213989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210213992 and 210214010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210214321) 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, 964176 + ... + 964393.

It is an arithmetic number, because the mean of its divisors is an integer number (53035675).

Almost surely, 2^210214021 is an apocalyptic number.

It is an amenable number.

210214021 is a deficient number, since it is larger than the sum of its proper divisors (1928679).

210214021 is a wasteful number, since it uses less digits than its factorization.

210214021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928678.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 210214021 is about 14498.7592917463. The cubic root of 210214021 is about 594.5940511817.

Adding to 210214021 its reverse (120412012), we get a palindrome (330626033).

The spelling of 210214021 in words is "two hundred ten million, two hundred fourteen thousand, twenty-one".