19990201303021 has 4 divisors (see below), whose sum is σ = 20002594485852. Its totient is φ = 19977808120192.

The previous prime is 19990201302991. The next prime is 19990201303031. The reversal of 19990201303021 is 12030310209991.

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 5106307361796 + 14883893941225 = 2259714^2 + 3857965^2 .

It is a cyclic number.

It is not a de Polignac number, because 19990201303021 - 2¹⁵ = 19990201270253 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 (19990201303031) 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, 6196588996 + ... + 6196592221.

It is an arithmetic number, because the mean of its divisors is an integer number (5000648621463).

Almost surely, 2^{19990201303021} is an apocalyptic number.

It is an amenable number.

19990201303021 is a deficient number, since it is larger than the sum of its proper divisors (12393182831).

19990201303021 is a wasteful number, since it uses less digits than its factorization.

19990201303021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12393182830.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 19990201303021 in words is "nineteen trillion, nine hundred ninety billion, two hundred one million, three hundred three thousand, twenty-one".