8126203116221 has 16 divisors (see below), whose sum is σ = 8791443972864. Its totient is φ = 7481919565824.

The previous prime is 8126203116209. The next prime is 8126203116233. The reversal of 8126203116221 is 1226113026218.

It is an interprime number because it is at equal distance from previous prime (8126203116209) and next prime (8126203116233).

It is a cyclic number.

It is not a de Polignac number, because 8126203116221 - 2²² = 8126198921917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8126203116271) 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, 718355 + ... + 4094928.

It is an arithmetic number, because the mean of its divisors is an integer number (549465248304).

Almost surely, 2^{8126203116221} is an apocalyptic number.

It is an amenable number.

8126203116221 is a deficient number, since it is larger than the sum of its proper divisors (665240856643).

8126203116221 is a wasteful number, since it uses less digits than its factorization.

8126203116221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4815460.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 8126203116221 in words is "eight trillion, one hundred twenty-six billion, two hundred three million, one hundred sixteen thousand, two hundred twenty-one".