8216342421 has 8 divisors (see below), whose sum is σ = 12520140864. Its totient is φ = 4695052800.

The previous prime is 8216342411. The next prime is 8216342423. The reversal of 8216342421 is 1242436128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8216342421 - 2⁷ = 8216342293 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8216342423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195627180 + ... + 195627221.

It is an arithmetic number, because the mean of its divisors is an integer number (1565017608).

Almost surely, 2^8216342421 is an apocalyptic number.

It is an amenable number.

8216342421 is a deficient number, since it is larger than the sum of its proper divisors (4303798443).

8216342421 is a wasteful number, since it uses less digits than its factorization.

8216342421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391254411.

The product of its digits is 18432, while the sum is 33.

The square root of 8216342421 is about 90644.0423911026. The cubic root of 8216342421 is about 2017.8684194567.

Adding to 8216342421 its reverse (1242436128), we get a palindrome (9458778549).

The spelling of 8216342421 in words is "eight billion, two hundred sixteen million, three hundred forty-two thousand, four hundred twenty-one".