521012213135345 has 8 divisors (see below), whose sum is σ = 625224986666280. Its totient is φ = 416802883239040.

The previous prime is 521012213135299. The next prime is 521012213135387. The reversal of 521012213135345 is 543531312210125.

It can be written as a sum of positive squares in 4 ways, for example, as 5224145638321 + 515788067497024 = 2285639^2 + 22710968^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521012213135345 - 2¹⁶ = 521012213069809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521012213135299 and 521012213135308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860575790 + ... + 861180999.

It is an arithmetic number, because the mean of its divisors is an integer number (78153123333285).

Almost surely, 2^{521012213135345} is an apocalyptic number.

It is an amenable number.

521012213135345 is a deficient number, since it is larger than the sum of its proper divisors (104212773530935).

521012213135345 is a wasteful number, since it uses less digits than its factorization.

521012213135345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721817315.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 521012213135345 in words is "five hundred twenty-one trillion, twelve billion, two hundred thirteen million, one hundred thirty-five thousand, three hundred forty-five".