8421155 has 4 divisors (see below), whose sum is σ = 10105392. Its totient is φ = 6736920.

The previous prime is 8421143. The next prime is 8421167. The reversal of 8421155 is 5511248.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8421143) and next prime (8421167).

It is not a de Polignac number, because 8421155 - 2¹⁴ = 8404771 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 842111 + ... + 842120.

It is an arithmetic number, because the mean of its divisors is an integer number (2526348).

Almost surely, 2^8421155 is an apocalyptic number.

8421155 is a deficient number, since it is larger than the sum of its proper divisors (1684237).

8421155 is a wasteful number, since it uses less digits than its factorization.

8421155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684236.

The product of its digits is 1600, while the sum is 26.

The square root of 8421155 is about 2901.9226385278. The cubic root of 8421155 is about 203.4497780270.

The spelling of 8421155 in words is "eight million, four hundred twenty-one thousand, one hundred fifty-five".