20511604346213 has 2 divisors, whose sum is σ = 20511604346214. Its totient is φ = 20511604346212.

The previous prime is 20511604346171. The next prime is 20511604346239. The reversal of 20511604346213 is 31264340611502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18377194380769 + 2134409965444 = 4286863^2 + 1460962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20511604346213 - 2²² = 20511600151909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20511604342213) 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, 10255802173106 + 10255802173107.

It is an arithmetic number, because the mean of its divisors is an integer number (10255802173107).

Almost surely, 2^{20511604346213} is an apocalyptic number.

It is an amenable number.

20511604346213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20511604346213 is an equidigital number, since it uses as much as digits as its factorization.

20511604346213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

Adding to 20511604346213 its reverse (31264340611502), we get a palindrome (51775944957715).

The spelling of 20511604346213 in words is "twenty trillion, five hundred eleven billion, six hundred four million, three hundred forty-six thousand, two hundred thirteen".