213233521 has 2 divisors, whose sum is σ = 213233522. Its totient is φ = 213233520.

The previous prime is 213233507. The next prime is 213233543. The reversal of 213233521 is 125332312.

It is an a-pointer prime, because the next prime (213233543) can be obtained adding 213233521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191517921 + 21715600 = 13839^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 213233521 - 2⁷ = 213233393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213233492 and 213233501.

It is not a weakly prime, because it can be changed into another prime (213233551) 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 as a sum of consecutive naturals, namely, 106616760 + 106616761.

It is an arithmetic number, because the mean of its divisors is an integer number (106616761).

Almost surely, 2^213233521 is an apocalyptic number.

It is an amenable number.

213233521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213233521 is an equidigital number, since it uses as much as digits as its factorization.

213233521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 22.

The square root of 213233521 is about 14602.5176253960. The cubic root of 213233521 is about 597.4274309489.

Adding to 213233521 its reverse (125332312), we get a palindrome (338565833).

It can be divided in two parts, 2132 and 33521, that added together give a palindrome (35653).

The spelling of 213233521 in words is "two hundred thirteen million, two hundred thirty-three thousand, five hundred twenty-one".