213014521 has 4 divisors (see below), whose sum is σ = 213337444. Its totient is φ = 212691600.

The previous prime is 213014519. The next prime is 213014537. The reversal of 213014521 is 125410312.

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 134444025 + 78570496 = 11595^2 + 8864^2 .

It is a cyclic number.

It is not a de Polignac number, because 213014521 - 2¹ = 213014519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213014551) 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 3 ways as a sum of consecutive naturals, for example, 160470 + ... + 161791.

It is an arithmetic number, because the mean of its divisors is an integer number (53334361).

Almost surely, 2^213014521 is an apocalyptic number.

It is an amenable number.

213014521 is a deficient number, since it is larger than the sum of its proper divisors (322923).

213014521 is an equidigital number, since it uses as much as digits as its factorization.

213014521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322922.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 213014521 is about 14595.0169921107. The cubic root of 213014521 is about 597.2228329977. Note that the first 3 decimals are identical.

Adding to 213014521 its reverse (125410312), we get a palindrome (338424833).

The spelling of 213014521 in words is "two hundred thirteen million, fourteen thousand, five hundred twenty-one".