999999902221 has 8 divisors (see below), whose sum is σ = 1035150543000. Its totient is φ = 964893787200.

The previous prime is 999999902207. The next prime is 999999902227. The reversal of 999999902221 is 122209999999.

It can be written as a sum of positive squares in 4 ways, for example, as 39376449225 + 960623452996 = 198435^2 + 980114^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 999999902221 - 2²¹ = 999997805069 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 (999999902227) 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, 11085730 + ... + 11175571.

It is an arithmetic number, because the mean of its divisors is an integer number (129393817875).

Almost surely, 2^999999902221 is an apocalyptic number.

It is an amenable number.

999999902221 is a deficient number, since it is larger than the sum of its proper divisors (35150640779).

999999902221 is a wasteful number, since it uses less digits than its factorization.

999999902221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22262879.

The product of its (nonzero) digits is 38263752, while the sum is 70.

The spelling of 999999902221 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred two thousand, two hundred twenty-one".