8421955842111 has 48 divisors (see below), whose sum is σ = 13832169452640. Its totient is φ = 4529077217280.

The previous prime is 8421955842109. The next prime is 8421955842137. The reversal of 8421955842111 is 1112485591248.

It is not a de Polignac number, because 8421955842111 - 2¹ = 8421955842109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421955842101) 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, 31205595 + ... + 31474323.

It is an arithmetic number, because the mean of its divisors is an integer number (288170196930).

Almost surely, 2^{8421955842111} is an apocalyptic number.

8421955842111 is a deficient number, since it is larger than the sum of its proper divisors (5410213610529).

8421955842111 is a wasteful number, since it uses less digits than its factorization.

8421955842111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281304 (or 281297 counting only the distinct ones).

The product of its digits is 921600, while the sum is 51.

The spelling of 8421955842111 in words is "eight trillion, four hundred twenty-one billion, nine hundred fifty-five million, eight hundred forty-two thousand, one hundred eleven".