20821248687341 has 2 divisors, whose sum is σ = 20821248687342. Its totient is φ = 20821248687340.

The previous prime is 20821248687307. The next prime is 20821248687359. The reversal of 20821248687341 is 14378684212802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17158442175625 + 3662806511716 = 4142275^2 + 1913846^2 .

It is a cyclic number.

It is not a de Polignac number, because 20821248687341 - 2⁴² = 16423202176237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20821248687361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10410624343670 + 10410624343671.

It is an arithmetic number, because the mean of its divisors is an integer number (10410624343671).

Almost surely, 2^{20821248687341} is an apocalyptic number.

It is an amenable number.

20821248687341 is a deficient number, since it is larger than the sum of its proper divisors (1).

20821248687341 is an equidigital number, since it uses as much as digits as its factorization.

20821248687341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8257536, while the sum is 56.

The spelling of 20821248687341 in words is "twenty trillion, eight hundred twenty-one billion, two hundred forty-eight million, six hundred eighty-seven thousand, three hundred forty-one".