213228521 has 8 divisors (see below), whose sum is σ = 238900224. Its totient is φ = 188604720.

The previous prime is 213228511. The next prime is 213228527. The reversal of 213228521 is 125822312.

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

It is a cyclic number.

It is not a de Polignac number, because 213228521 - 2¹⁴ = 213212137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213228527) 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 7 ways as a sum of consecutive naturals, for example, 261545 + ... + 262358.

It is an arithmetic number, because the mean of its divisors is an integer number (29862528).

Almost surely, 2^213228521 is an apocalyptic number.

It is an amenable number.

213228521 is a deficient number, since it is larger than the sum of its proper divisors (25671703).

213228521 is a wasteful number, since it uses less digits than its factorization.

213228521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523951.

The product of its digits is 1920, while the sum is 26.

The square root of 213228521 is about 14602.3464210380. The cubic root of 213228521 is about 597.4227613258.

The spelling of 213228521 in words is "two hundred thirteen million, two hundred twenty-eight thousand, five hundred twenty-one".