395454535459021 has 2 divisors, whose sum is σ = 395454535459022. Its totient is φ = 395454535459020.

The previous prime is 395454535459003. The next prime is 395454535459079. The reversal of 395454535459021 is 120954535454593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297897727361796 + 97556808097225 = 17259714^2 + 9877085^2 .

It is an emirp because it is prime and its reverse (120954535454593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395454535459021 - 2⁵ = 395454535458989 is a prime.

It is a super-2 number, since 2×395454535459021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395454535459121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197727267729510 + 197727267729511.

It is an arithmetic number, because the mean of its divisors is an integer number (197727267729511).

Almost surely, 2^{395454535459021} is an apocalyptic number.

It is an amenable number.

395454535459021 is a deficient number, since it is larger than the sum of its proper divisors (1).

395454535459021 is an equidigital number, since it uses as much as digits as its factorization.

395454535459021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 291600000, while the sum is 64.

The spelling of 395454535459021 in words is "three hundred ninety-five trillion, four hundred fifty-four billion, five hundred thirty-five million, four hundred fifty-nine thousand, twenty-one".