351221243554513 has 4 divisors (see below), whose sum is σ = 353251424153268. Its totient is φ = 349191062955760.

The previous prime is 351221243554501. The next prime is 351221243554609. The reversal of 351221243554513 is 315455342122153.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178211206078929 + 173010037475584 = 13349577^2 + 13153328^2 .

It is a cyclic number.

It is not a de Polignac number, because 351221243554513 - 2¹³ = 351221243546321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (351221243555513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015090299118 + ... + 1015090299463.

It is an arithmetic number, because the mean of its divisors is an integer number (88312856038317).

Almost surely, 2^{351221243554513} is an apocalyptic number.

It is an amenable number.

351221243554513 is a deficient number, since it is larger than the sum of its proper divisors (2030180598755).

351221243554513 is a wasteful number, since it uses less digits than its factorization.

351221243554513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030180598754.

The product of its digits is 2160000, while the sum is 46.

Adding to 351221243554513 its reverse (315455342122153), we get a palindrome (666676585676666).

The spelling of 351221243554513 in words is "three hundred fifty-one trillion, two hundred twenty-one billion, two hundred forty-three million, five hundred fifty-four thousand, five hundred thirteen".