213075521 has 2 divisors, whose sum is σ = 213075522. Its totient is φ = 213075520.

The previous prime is 213075517. The next prime is 213075601. The reversal of 213075521 is 125570312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156525121 + 56550400 = 12511^2 + 7520^2 .

It is a cyclic number.

It is not a de Polignac number, because 213075521 - 2² = 213075517 is a prime.

It is not a weakly prime, because it can be changed into another prime (213075221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106537760 + 106537761.

It is an arithmetic number, because the mean of its divisors is an integer number (106537761).

Almost surely, 2^213075521 is an apocalyptic number.

It is an amenable number.

213075521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213075521 is an equidigital number, since it uses as much as digits as its factorization.

213075521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 26.

The square root of 213075521 is about 14597.1065968568. The cubic root of 213075521 is about 597.2798355528.

The spelling of 213075521 in words is "two hundred thirteen million, seventy-five thousand, five hundred twenty-one".