9877776543221 has 48 divisors (see below), whose sum is σ = 11452244496000. Its totient is φ = 8484294067200.

The previous prime is 9877776543191. The next prime is 9877776543227. The reversal of 9877776543221 is 1223456777789.

It is not a de Polignac number, because 9877776543221 - 2¹⁸ = 9877776281077 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9877776543227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 69835271 + ... + 69976571.

It is an arithmetic number, because the mean of its divisors is an integer number (238588427000).

Almost surely, 2^{9877776543221} is an apocalyptic number.

It is an amenable number.

9877776543221 is a deficient number, since it is larger than the sum of its proper divisors (1574467952779).

9877776543221 is a wasteful number, since it uses less digits than its factorization.

9877776543221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141822 (or 141805 counting only the distinct ones).

The product of its digits is 248935680, while the sum is 68.

The spelling of 9877776543221 in words is "nine trillion, eight hundred seventy-seven billion, seven hundred seventy-six million, five hundred forty-three thousand, two hundred twenty-one".