19990202101 has 4 divisors (see below), whose sum is σ = 20002267852. Its totient is φ = 19978136352.

The previous prime is 19990202087. The next prime is 19990202171. The reversal of 19990202101 is 10120209991.

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 9776067876 + 10214134225 = 98874^2 + 101065^2 .

It is a cyclic number.

It is not a de Polignac number, because 19990202101 - 2⁵ = 19990202069 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 (19990202171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6030390 + ... + 6033703.

It is an arithmetic number, because the mean of its divisors is an integer number (5000566963).

Almost surely, 2^19990202101 is an apocalyptic number.

It is an amenable number.

19990202101 is a deficient number, since it is larger than the sum of its proper divisors (12065751).

19990202101 is a wasteful number, since it uses less digits than its factorization.

19990202101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12065750.

The product of its (nonzero) digits is 2916, while the sum is 34.

The spelling of 19990202101 in words is "nineteen billion, nine hundred ninety million, two hundred two thousand, one hundred one".