20531221282345 has 8 divisors (see below), whose sum is σ = 24667256916864. Its totient is φ = 16405116107184.

The previous prime is 20531221282291. The next prime is 20531221282367. The reversal of 20531221282345 is 54328212213502.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531221282345 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20531221282298 and 20531221282307.

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, 2482610289 + ... + 2482618558.

It is an arithmetic number, because the mean of its divisors is an integer number (3083407114608).

Almost surely, 2^{20531221282345} is an apocalyptic number.

It is an amenable number.

20531221282345 is a deficient number, since it is larger than the sum of its proper divisors (4136035634519).

20531221282345 is an equidigital number, since it uses as much as digits as its factorization.

20531221282345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4965229679.

The product of its (nonzero) digits is 230400, while the sum is 40.

Adding to 20531221282345 its reverse (54328212213502), we get a palindrome (74859433495847).

The spelling of 20531221282345 in words is "twenty trillion, five hundred thirty-one billion, two hundred twenty-one million, two hundred eighty-two thousand, three hundred forty-five".