2112840396821 has 8 divisors (see below), whose sum is σ = 2634190624704. Its totient is φ = 1646369140320.

The previous prime is 2112840396811. The next prime is 2112840396853. The reversal of 2112840396821 is 1286930482112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2112840396821 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 (2112840396811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13719742760 + ... + 13719742913.

It is an arithmetic number, because the mean of its divisors is an integer number (329273828088).

Almost surely, 2^{2112840396821} is an apocalyptic number.

It is an amenable number.

2112840396821 is a deficient number, since it is larger than the sum of its proper divisors (521350227883).

2112840396821 is a wasteful number, since it uses less digits than its factorization.

2112840396821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27439485691.

The product of its (nonzero) digits is 331776, while the sum is 47.

The spelling of 2112840396821 in words is "two trillion, one hundred twelve billion, eight hundred forty million, three hundred ninety-six thousand, eight hundred twenty-one".