213098521 has 2 divisors, whose sum is σ = 213098522. Its totient is φ = 213098520.

The previous prime is 213098453. The next prime is 213098533. The reversal of 213098521 is 125890312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201782025 + 11316496 = 14205^2 + 3364^2 .

It is a cyclic number.

It is not a de Polignac number, because 213098521 - 2¹³ = 213090329 is a prime.

It is not a weakly prime, because it can be changed into another prime (213098551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106549260 + 106549261.

It is an arithmetic number, because the mean of its divisors is an integer number (106549261).

Almost surely, 2^213098521 is an apocalyptic number.

It is an amenable number.

213098521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213098521 is an equidigital number, since it uses as much as digits as its factorization.

213098521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 213098521 is about 14597.8944029610. The cubic root of 213098521 is about 597.3013254951.

The spelling of 213098521 in words is "two hundred thirteen million, ninety-eight thousand, five hundred twenty-one".