447657113546021 has 2 divisors, whose sum is σ = 447657113546022. Its totient is φ = 447657113546020.

The previous prime is 447657113545997. The next prime is 447657113546039. The reversal of 447657113546021 is 120645311756744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408642586308100 + 39014527237921 = 20214910^2 + 6246161^2 .

It is a cyclic number.

It is not a de Polignac number, because 447657113546021 - 2⁴⁶ = 377288369368357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447657113546081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223828556773010 + 223828556773011.

It is an arithmetic number, because the mean of its divisors is an integer number (223828556773011).

Almost surely, 2^{447657113546021} is an apocalyptic number.

It is an amenable number.

447657113546021 is a deficient number, since it is larger than the sum of its proper divisors (1).

447657113546021 is an equidigital number, since it uses as much as digits as its factorization.

447657113546021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 447657113546021 in words is "four hundred forty-seven trillion, six hundred fifty-seven billion, one hundred thirteen million, five hundred forty-six thousand, twenty-one".