990021200202004 has 6 divisors (see below), whose sum is σ = 1732537100353514. Its totient is φ = 495010600101000.

The previous prime is 990021200201977. The next prime is 990021200202007. The reversal of 990021200202004 is 400202002120099.

It can be written as a sum of positive squares in only one way, i.e., 807645358486404 + 182375841715600 = 28419102^2 + 13504660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990021200202007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123752650025247 + ... + 123752650025254.

Almost surely, 2^{990021200202004} is an apocalyptic number.

It is an amenable number.

990021200202004 is a deficient number, since it is larger than the sum of its proper divisors (742515900151510).

990021200202004 is a wasteful number, since it uses less digits than its factorization.

990021200202004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247505300050505 (or 247505300050503 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 990021200202004 in words is "nine hundred ninety trillion, twenty-one billion, two hundred million, two hundred two thousand, four".