20011221203 has 16 divisors (see below), whose sum is σ = 21606077376. Its totient is φ = 18466406400.

The previous prime is 20011221193. The next prime is 20011221239. The reversal of 20011221203 is 30212211002.

It is a happy number.

It is not a de Polignac number, because 20011221203 - 2¹⁰ = 20011220179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20011221253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120275 + ... + 233427.

It is an arithmetic number, because the mean of its divisors is an integer number (1350379836).

Almost surely, 2^20011221203 is an apocalyptic number.

20011221203 is a deficient number, since it is larger than the sum of its proper divisors (1594856173).

20011221203 is a wasteful number, since it uses less digits than its factorization.

20011221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113374.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20011221203 its reverse (30212211002), we get a palindrome (50223432205).

The spelling of 20011221203 in words is "twenty billion, eleven million, two hundred twenty-one thousand, two hundred three".