5631221365 has 40 divisors (see below), whose sum is σ = 8600100768. Its totient is φ = 3510289440.

The previous prime is 5631221347. The next prime is 5631221417.

5631221365 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5631221365 - 2⁹ = 5631220853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5631221365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 110734 + ... + 153376.

Almost surely, 2^5631221365 is an apocalyptic number.

5631221365 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5631221365 is a deficient number, since it is larger than the sum of its proper divisors (2968879403).

5631221365 is an equidigital number, since it uses as much as digits as its factorization.

5631221365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42687 (or 42666 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 5631221365 is about 75041.4643047429. The cubic root of 5631221365 is about 1779.1020767857.

It can be divided in two parts, 56312 and 21365, that added together give a palindrome (77677).

The spelling of 5631221365 in words is "five billion, six hundred thirty-one million, two hundred twenty-one thousand, three hundred sixty-five".