2838640856221 has 8 divisors (see below), whose sum is σ = 2844403509024. Its totient is φ = 2832880592880.

The previous prime is 2838640856201. The next prime is 2838640856243. The reversal of 2838640856221 is 1226580468382.

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

It is a cyclic number.

It is not a de Polignac number, because 2838640856221 - 2⁹ = 2838640855709 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 (2838640856201) 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, 1790686 + ... + 2980576.

It is an arithmetic number, because the mean of its divisors is an integer number (355550438628).

Almost surely, 2^{2838640856221} is an apocalyptic number.

It is an amenable number.

2838640856221 is a deficient number, since it is larger than the sum of its proper divisors (5762652803).

2838640856221 is a wasteful number, since it uses less digits than its factorization.

2838640856221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194731.

The product of its (nonzero) digits is 8847360, while the sum is 55.

The spelling of 2838640856221 in words is "two trillion, eight hundred thirty-eight billion, six hundred forty million, eight hundred fifty-six thousand, two hundred twenty-one".