20351220022513 has 2 divisors, whose sum is σ = 20351220022514. Its totient is φ = 20351220022512.

The previous prime is 20351220022499. The next prime is 20351220022543. The reversal of 20351220022513 is 31522002215302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14817326051584 + 5533893970929 = 3849328^2 + 2352423^2 .

It is a cyclic number.

It is not a de Polignac number, because 20351220022513 - 2³³ = 20342630087921 is a prime.

It is not a weakly prime, because it can be changed into another prime (20351220022543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175610011256 + 10175610011257.

It is an arithmetic number, because the mean of its divisors is an integer number (10175610011257).

Almost surely, 2^{20351220022513} is an apocalyptic number.

It is an amenable number.

20351220022513 is a deficient number, since it is larger than the sum of its proper divisors (1).

20351220022513 is an equidigital number, since it uses as much as digits as its factorization.

20351220022513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 20351220022513 its reverse (31522002215302), we get a palindrome (51873222237815).

The spelling of 20351220022513 in words is "twenty trillion, three hundred fifty-one billion, two hundred twenty million, twenty-two thousand, five hundred thirteen".