20001021021203 has 16 divisors (see below), whose sum is σ = 20740601193984. Its totient is φ = 19274783262240.

The previous prime is 20001021021197. The next prime is 20001021021217. The reversal of 20001021021203 is 30212012010002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20001021021203 - 2⁴ = 20001021021187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001021021103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5737913 + ... + 8539653.

It is an arithmetic number, because the mean of its divisors is an integer number (1296287574624).

Almost surely, 2^{20001021021203} is an apocalyptic number.

20001021021203 is a deficient number, since it is larger than the sum of its proper divisors (739580172781).

20001021021203 is a wasteful number, since it uses less digits than its factorization.

20001021021203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2804122.

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

Adding to 20001021021203 its reverse (30212012010002), we get a palindrome (50213033031205).

The spelling of 20001021021203 in words is "twenty trillion, one billion, twenty-one million, twenty-one thousand, two hundred three".