213213449 has 2 divisors, whose sum is σ = 213213450. Its totient is φ = 213213448.

The previous prime is 213213437. The next prime is 213213503. The reversal of 213213449 is 944312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196140025 + 17073424 = 14005^2 + 4132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213213449 is a prime.

It is not a weakly prime, because it can be changed into another prime (213213349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106606724 + 106606725.

It is an arithmetic number, because the mean of its divisors is an integer number (106606725).

Almost surely, 2^213213449 is an apocalyptic number.

It is an amenable number.

213213449 is a deficient number, since it is larger than the sum of its proper divisors (1).

213213449 is an equidigital number, since it uses as much as digits as its factorization.

213213449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 213213449 is about 14601.8303304757. The cubic root of 213213449 is about 597.4086847724.

The spelling of 213213449 in words is "two hundred thirteen million, two hundred thirteen thousand, four hundred forty-nine".