10212578368721 has 2 divisors, whose sum is σ = 10212578368722. Its totient is φ = 10212578368720.

The previous prime is 10212578368709. The next prime is 10212578368789. The reversal of 10212578368721 is 12786387521201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6416413228096 + 3796165140625 = 2533064^2 + 1948375^2 .

It is a cyclic number.

It is not a de Polignac number, because 10212578368721 - 2²² = 10212574174417 is a prime.

It is not a weakly prime, because it can be changed into another prime (10212578361721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5106289184360 + 5106289184361.

It is an arithmetic number, because the mean of its divisors is an integer number (5106289184361).

Almost surely, 2^{10212578368721} is an apocalyptic number.

It is an amenable number.

10212578368721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10212578368721 is an equidigital number, since it uses as much as digits as its factorization.

10212578368721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 10212578368721 in words is "ten trillion, two hundred twelve billion, five hundred seventy-eight million, three hundred sixty-eight thousand, seven hundred twenty-one".