53571720700721 has 2 divisors, whose sum is σ = 53571720700722. Its totient is φ = 53571720700720.

The previous prime is 53571720700699. The next prime is 53571720700741. The reversal of 53571720700721 is 12700702717535.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42596977476496 + 10974743224225 = 6526636^2 + 3312815^2 .

It is a cyclic number.

It is not a de Polignac number, because 53571720700721 - 2³⁴ = 53554540831537 is a prime.

It is a super-2 number, since 2×53571720700721² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (53571720700741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26785860350360 + 26785860350361.

It is an arithmetic number, because the mean of its divisors is an integer number (26785860350361).

Almost surely, 2^{53571720700721} is an apocalyptic number.

It is an amenable number.

53571720700721 is a deficient number, since it is larger than the sum of its proper divisors (1).

53571720700721 is an equidigital number, since it uses as much as digits as its factorization.

53571720700721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720300, while the sum is 47.

The spelling of 53571720700721 in words is "fifty-three trillion, five hundred seventy-one billion, seven hundred twenty million, seven hundred thousand, seven hundred twenty-one".