213234521 has 2 divisors, whose sum is σ = 213234522. Its totient is φ = 213234520.

The previous prime is 213234517. The next prime is 213234569. The reversal of 213234521 is 125432312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164737225 + 48497296 = 12835^2 + 6964^2 .

It is a cyclic number.

It is not a de Polignac number, because 213234521 - 2² = 213234517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213234821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106617260 + 106617261.

It is an arithmetic number, because the mean of its divisors is an integer number (106617261).

Almost surely, 2^213234521 is an apocalyptic number.

It is an amenable number.

213234521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213234521 is an equidigital number, since it uses as much as digits as its factorization.

213234521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 23.

The square root of 213234521 is about 14602.5518660267. The cubic root of 213234521 is about 597.4283648647.

Adding to 213234521 its reverse (125432312), we get a palindrome (338666833).

The spelling of 213234521 in words is "two hundred thirteen million, two hundred thirty-four thousand, five hundred twenty-one".