21241211095757 has 2 divisors, whose sum is σ = 21241211095758. Its totient is φ = 21241211095756.

The previous prime is 21241211095751. The next prime is 21241211095787. The reversal of 21241211095757 is 75759011214212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14188925378761 + 7052285716996 = 3766819^2 + 2655614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21241211095757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21241211095751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620605547878 + 10620605547879.

It is an arithmetic number, because the mean of its divisors is an integer number (10620605547879).

Almost surely, 2^{21241211095757} is an apocalyptic number.

It is an amenable number.

21241211095757 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241211095757 is an equidigital number, since it uses as much as digits as its factorization.

21241211095757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 352800, while the sum is 47.

The spelling of 21241211095757 in words is "twenty-one trillion, two hundred forty-one billion, two hundred eleven million, ninety-five thousand, seven hundred fifty-seven".