27450454021 has 4 divisors (see below), whose sum is σ = 27462102732. Its totient is φ = 27438805312.

The previous prime is 27450454019. The next prime is 27450454033. The reversal of 27450454021 is 12045405472.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10345737796 + 17104716225 = 101714^2 + 130785^2 .

It is a cyclic number.

It is not a de Polignac number, because 27450454021 - 2¹ = 27450454019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27450454001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5820820 + ... + 5825533.

It is an arithmetic number, because the mean of its divisors is an integer number (6865525683).

Almost surely, 2^27450454021 is an apocalyptic number.

It is an amenable number.

27450454021 is a deficient number, since it is larger than the sum of its proper divisors (11648711).

27450454021 is a wasteful number, since it uses less digits than its factorization.

27450454021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11648710.

The product of its (nonzero) digits is 44800, while the sum is 34.

Adding to 27450454021 its reverse (12045405472), we get a palindrome (39495859493).

The spelling of 27450454021 in words is "twenty-seven billion, four hundred fifty million, four hundred fifty-four thousand, twenty-one".