899999994221 has 4 divisors (see below), whose sum is σ = 900237277212. Its totient is φ = 899762711232.

The previous prime is 899999994199. The next prime is 899999994239. The reversal of 899999994221 is 122499999998.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78464413225 + 821535580996 = 280115^2 + 906386^2 .

It is a cyclic number.

It is not a de Polignac number, because 899999994221 - 2³⁴ = 882820125037 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 (899999994241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118635806 + ... + 118643391.

It is an arithmetic number, because the mean of its divisors is an integer number (225059319303).

Almost surely, 2^899999994221 is an apocalyptic number.

It is an amenable number.

899999994221 is a deficient number, since it is larger than the sum of its proper divisors (237282991).

899999994221 is a wasteful number, since it uses less digits than its factorization.

899999994221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237282990.

The product of its digits is 612220032, while the sum is 80.

The spelling of 899999994221 in words is "eight hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-four thousand, two hundred twenty-one".