1284040382821 has 16 divisors (see below), whose sum is σ = 1492400764800. Its totient is φ = 1081912851648.

The previous prime is 1284040382819. The next prime is 1284040382857. The reversal of 1284040382821 is 1282830404821.

It is a cyclic number.

It is not a de Polignac number, because 1284040382821 - 2¹ = 1284040382819 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 (1284040382861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21937831 + ... + 21996283.

It is an arithmetic number, because the mean of its divisors is an integer number (93275047800).

Almost surely, 2^{1284040382821} is an apocalyptic number.

It is an amenable number.

1284040382821 is a deficient number, since it is larger than the sum of its proper divisors (208360381979).

1284040382821 is an equidigital number, since it uses as much as digits as its factorization.

1284040382821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111708.

The product of its (nonzero) digits is 196608, while the sum is 43.

The spelling of 1284040382821 in words is "one trillion, two hundred eighty-four billion, forty million, three hundred eighty-two thousand, eight hundred twenty-one".