19991220003 has 24 divisors (see below), whose sum is σ = 28965181440. Its totient is φ = 13286473200.

The previous prime is 19991220001. The next prime is 19991220013. The reversal of 19991220003 is 30002219991.

It is a happy number.

It is not a de Polignac number, because 19991220003 - 2¹ = 19991220001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19991220003.

It is not an unprimeable number, because it can be changed into a prime (19991220001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8128588 + ... + 8131046.

It is an arithmetic number, because the mean of its divisors is an integer number (1206882560).

Almost surely, 2^19991220003 is an apocalyptic number.

19991220003 is a deficient number, since it is larger than the sum of its proper divisors (8973961437).

19991220003 is a wasteful number, since it uses less digits than its factorization.

19991220003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879 (or 4876 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

Adding to 19991220003 its reverse (30002219991), we get a palindrome (49993439994).

The spelling of 19991220003 in words is "nineteen billion, nine hundred ninety-one million, two hundred twenty thousand, three".