20021221203 has 8 divisors (see below), whose sum is σ = 26814670848. Its totient is φ = 13287626184.

The previous prime is 20021221159. The next prime is 20021221211. The reversal of 20021221203 is 30212212002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20021221203 - 2²⁵ = 19987666771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021201203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14962875 + ... + 14964212.

It is an arithmetic number, because the mean of its divisors is an integer number (3351833856).

Almost surely, 2^20021221203 is an apocalyptic number.

20021221203 is a deficient number, since it is larger than the sum of its proper divisors (6793449645).

20021221203 is a wasteful number, since it uses less digits than its factorization.

20021221203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29927313.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 20021221203 its reverse (30212212002), we get a palindrome (50233433205).

The spelling of 20021221203 in words is "twenty billion, twenty-one million, two hundred twenty-one thousand, two hundred three".