214521521 has 6 divisors (see below), whose sum is σ = 227883030. Its totient is φ = 201902336.

The previous prime is 214521491. The next prime is 214521563. The reversal of 214521521 is 125125412.

214521521 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 3 ways, for example, as 115240225 + 99281296 = 10735^2 + 9964^2 .

It is not a de Polignac number, because 214521521 - 2²² = 210327217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (214521221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 370856 + ... + 371433.

It is an arithmetic number, because the mean of its divisors is an integer number (37980505).

Almost surely, 2^214521521 is an apocalyptic number.

It is an amenable number.

214521521 is a deficient number, since it is larger than the sum of its proper divisors (13361509).

214521521 is an equidigital number, since it uses as much as digits as its factorization.

214521521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742323 (or 742306 counting only the distinct ones).

The product of its digits is 800, while the sum is 23.

The square root of 214521521 is about 14646.5532122749. The cubic root of 214521521 is about 598.6279026027.

Adding to 214521521 its reverse (125125412), we get a palindrome (339646933).

The spelling of 214521521 in words is "two hundred fourteen million, five hundred twenty-one thousand, five hundred twenty-one".