20911120269397 has 2 divisors, whose sum is σ = 20911120269398. Its totient is φ = 20911120269396.

The previous prime is 20911120269307. The next prime is 20911120269401. The reversal of 20911120269397 is 79396202111902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20262836033476 + 648284235921 = 4501426^2 + 805161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20911120269397 is a prime.

It is a super-3 number, since 3×20911120269397³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20911120269307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10455560134698 + 10455560134699.

It is an arithmetic number, because the mean of its divisors is an integer number (10455560134699).

Almost surely, 2^{20911120269397} is an apocalyptic number.

It is an amenable number.

20911120269397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20911120269397 is an equidigital number, since it uses as much as digits as its factorization.

20911120269397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 20911120269397 in words is "twenty trillion, nine hundred eleven billion, one hundred twenty million, two hundred sixty-nine thousand, three hundred ninety-seven".