214311521 has 4 divisors (see below), whose sum is σ = 214780932. Its totient is φ = 213842112.

The previous prime is 214311473. The next prime is 214311523. The reversal of 214311521 is 125113412.

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 96805921 + 117505600 = 9839^2 + 10840^2 .

It is a cyclic number.

It is not a de Polignac number, because 214311521 - 2⁶ = 214311457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 214311493 and 214311502.

It is not an unprimeable number, because it can be changed into a prime (214311523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234020 + ... + 234933.

It is an arithmetic number, because the mean of its divisors is an integer number (53695233).

Almost surely, 2^214311521 is an apocalyptic number.

It is an amenable number.

214311521 is a deficient number, since it is larger than the sum of its proper divisors (469411).

214311521 is an equidigital number, since it uses as much as digits as its factorization.

214311521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469410.

The product of its digits is 240, while the sum is 20.

The square root of 214311521 is about 14639.3825347929. The cubic root of 214311521 is about 598.4325020014.

Adding to 214311521 its reverse (125113412), we get a palindrome (339424933).

The spelling of 214311521 in words is "two hundred fourteen million, three hundred eleven thousand, five hundred twenty-one".