13220354355531 has 16 divisors (see below), whose sum is σ = 17661056185344. Its totient is φ = 8796622512384.

The previous prime is 13220354355503. The next prime is 13220354355613. The reversal of 13220354355531 is 13555345302231.

It is not a de Polignac number, because 13220354355531 - 2¹⁰ = 13220354354507 is a prime.

It is a super-2 number, since 2×13220354355531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13220354350531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3185890 + ... + 6049016.

It is an arithmetic number, because the mean of its divisors is an integer number (1103816011584).

Almost surely, 2^{13220354355531} is an apocalyptic number.

13220354355531 is a deficient number, since it is larger than the sum of its proper divisors (4440701829813).

13220354355531 is a wasteful number, since it uses less digits than its factorization.

13220354355531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866090.

The product of its (nonzero) digits is 810000, while the sum is 42.

Adding to 13220354355531 its reverse (13555345302231), we get a palindrome (26775699657762).

The spelling of 13220354355531 in words is "thirteen trillion, two hundred twenty billion, three hundred fifty-four million, three hundred fifty-five thousand, five hundred thirty-one".