2231320302561 has 32 divisors (see below), whose sum is σ = 3538148613120. Its totient is φ = 1224279774144.

The previous prime is 2231320302557. The next prime is 2231320302619. The reversal of 2231320302561 is 1652030231322.

It is not a de Polignac number, because 2231320302561 - 2² = 2231320302557 is a prime.

It is a super-3 number, since 3×2231320302561³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2231320303561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20887470 + ... + 20994023.

It is an arithmetic number, because the mean of its divisors is an integer number (110567144160).

Almost surely, 2^{2231320302561} is an apocalyptic number.

2231320302561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2231320302561 is a deficient number, since it is larger than the sum of its proper divisors (1306828310559).

2231320302561 is a wasteful number, since it uses less digits than its factorization.

2231320302561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41881605.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 2231320302561 its reverse (1652030231322), we get a palindrome (3883350533883).

The spelling of 2231320302561 in words is "two trillion, two hundred thirty-one billion, three hundred twenty million, three hundred two thousand, five hundred sixty-one".