54421621057709 has 2 divisors, whose sum is σ = 54421621057710. Its totient is φ = 54421621057708.

The previous prime is 54421621057597. The next prime is 54421621057711. The reversal of 54421621057709 is 90775012612445.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44103584948809 + 10318036108900 = 6641053^2 + 3212170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54421621057709 is a prime.

Together with 54421621057711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54421621057409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27210810528854 + 27210810528855.

It is an arithmetic number, because the mean of its divisors is an integer number (27210810528855).

Almost surely, 2^{54421621057709} is an apocalyptic number.

It is an amenable number.

54421621057709 is a deficient number, since it is larger than the sum of its proper divisors (1).

54421621057709 is an equidigital number, since it uses as much as digits as its factorization.

54421621057709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 53.

The spelling of 54421621057709 in words is "fifty-four trillion, four hundred twenty-one billion, six hundred twenty-one million, fifty-seven thousand, seven hundred nine".