213514722521 has 2 divisors, whose sum is σ = 213514722522. Its totient is φ = 213514722520.

The previous prime is 213514722517. The next prime is 213514722559. The reversal of 213514722521 is 125227415312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122304078400 + 91210644121 = 349720^2 + 302011^2 .

It is a cyclic number.

It is not a de Polignac number, because 213514722521 - 2² = 213514722517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (213514772521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106757361260 + 106757361261.

It is an arithmetic number, because the mean of its divisors is an integer number (106757361261).

Almost surely, 2^213514722521 is an apocalyptic number.

It is an amenable number.

213514722521 is a deficient number, since it is larger than the sum of its proper divisors (1).

213514722521 is an equidigital number, since it uses as much as digits as its factorization.

213514722521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 35.

The spelling of 213514722521 in words is "two hundred thirteen billion, five hundred fourteen million, seven hundred twenty-two thousand, five hundred twenty-one".