20869252421357 has 2 divisors, whose sum is σ = 20869252421358. Its totient is φ = 20869252421356.

The previous prime is 20869252421293. The next prime is 20869252421371. The reversal of 20869252421357 is 75312425296802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20843708071081 + 25544350276 = 4565491^2 + 159826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20869252421357 - 2⁶ = 20869252421293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20869252421057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10434626210678 + 10434626210679.

It is an arithmetic number, because the mean of its divisors is an integer number (10434626210679).

It is a 1-persistent number, because it is pandigital, but 2⋅20869252421357 = 41738504842714 is not.

Almost surely, 2^{20869252421357} is an apocalyptic number.

It is an amenable number.

20869252421357 is a deficient number, since it is larger than the sum of its proper divisors (1).

20869252421357 is an equidigital number, since it uses as much as digits as its factorization.

20869252421357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 20869252421357 in words is "twenty trillion, eight hundred sixty-nine billion, two hundred fifty-two million, four hundred twenty-one thousand, three hundred fifty-seven".