54949826821 has 2 divisors, whose sum is σ = 54949826822. Its totient is φ = 54949826820.

The previous prime is 54949826819. The next prime is 54949826849. The reversal of 54949826821 is 12862894945.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30773930625 + 24175896196 = 175425^2 + 155486^2 .

It is a cyclic number.

It is not a de Polignac number, because 54949826821 - 2¹ = 54949826819 is a prime.

Together with 54949826819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54949826851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27474913410 + 27474913411.

It is an arithmetic number, because the mean of its divisors is an integer number (27474913411).

Almost surely, 2^54949826821 is an apocalyptic number.

It is an amenable number.

54949826821 is a deficient number, since it is larger than the sum of its proper divisors (1).

54949826821 is an equidigital number, since it uses as much as digits as its factorization.

54949826821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9953280, while the sum is 58.

The spelling of 54949826821 in words is "fifty-four billion, nine hundred forty-nine million, eight hundred twenty-six thousand, eight hundred twenty-one".