20430211343261 has 2 divisors, whose sum is σ = 20430211343262. Its totient is φ = 20430211343260.

The previous prime is 20430211343231. The next prime is 20430211343327. The reversal of 20430211343261 is 16234311203402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19634921939161 + 795289404100 = 4431131^2 + 891790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20430211343261 is a prime.

It is a super-2 number, since 2×20430211343261² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430211343221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215105671630 + 10215105671631.

It is an arithmetic number, because the mean of its divisors is an integer number (10215105671631).

Almost surely, 2^{20430211343261} is an apocalyptic number.

It is an amenable number.

20430211343261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430211343261 is an equidigital number, since it uses as much as digits as its factorization.

20430211343261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 20430211343261 its reverse (16234311203402), we get a palindrome (36664522546663).

The spelling of 20430211343261 in words is "twenty trillion, four hundred thirty billion, two hundred eleven million, three hundred forty-three thousand, two hundred sixty-one".