8400421191 has 16 divisors (see below), whose sum is σ = 11945993184. Its totient is φ = 5232374784.

The previous prime is 8400421171. The next prime is 8400421193. The reversal of 8400421191 is 1911240048.

It is a de Polignac number, because none of the positive numbers 2^k-8400421191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8400421193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594160 + ... + 608133.

It is an arithmetic number, because the mean of its divisors is an integer number (746624574).

Almost surely, 2^8400421191 is an apocalyptic number.

8400421191 is a deficient number, since it is larger than the sum of its proper divisors (3545571993).

8400421191 is a wasteful number, since it uses less digits than its factorization.

8400421191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202450.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 8400421191 is about 91653.8116555989. The cubic root of 8400421191 is about 2032.8266890141.

The spelling of 8400421191 in words is "eight billion, four hundred million, four hundred twenty-one thousand, one hundred ninety-one".