8421041421 has 16 divisors (see below), whose sum is σ = 13435280320. Its totient is φ = 5182179120.

The previous prime is 8421041417. The next prime is 8421041423. The reversal of 8421041421 is 1241401248.

It is not a de Polignac number, because 8421041421 - 2² = 8421041417 is a prime.

It is a super-2 number, since 2×8421041421² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421041423) 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, 11995435 + ... + 11996136.

It is an arithmetic number, because the mean of its divisors is an integer number (839705020).

Almost surely, 2^8421041421 is an apocalyptic number.

It is an amenable number.

8421041421 is a deficient number, since it is larger than the sum of its proper divisors (5014238899).

8421041421 is a wasteful number, since it uses less digits than its factorization.

8421041421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23991593 (or 23991587 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 8421041421 is about 91766.2324659785. The cubic root of 8421041421 is about 2034.4886335728.

Adding to 8421041421 its reverse (1241401248), we get a palindrome (9662442669).

The spelling of 8421041421 in words is "eight billion, four hundred twenty-one million, forty-one thousand, four hundred twenty-one".