999886221 has 8 divisors (see below), whose sum is σ = 1481312960. Its totient is φ = 666590796.

The previous prime is 999886177. The next prime is 999886231. The reversal of 999886221 is 122688999.

999886221 is a `hidden beast` number, since 9 + 9 + 9 + 8 + 8 + 622 + 1 = 666.

It is not a de Polignac number, because 999886221 - 2¹⁴ = 999869837 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999886231) 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, 18516385 + ... + 18516438.

It is an arithmetic number, because the mean of its divisors is an integer number (185164120).

Almost surely, 2^999886221 is an apocalyptic number.

It is an amenable number.

999886221 is a deficient number, since it is larger than the sum of its proper divisors (481426739).

999886221 is a wasteful number, since it uses less digits than its factorization.

999886221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37032832 (or 37032826 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 999886221 is about 31620.9775465592. The cubic root of 999886221 is about 999.9620722282.

The spelling of 999886221 in words is "nine hundred ninety-nine million, eight hundred eighty-six thousand, two hundred twenty-one".