20111021203 has 16 divisors (see below), whose sum is σ = 24785876416. Its totient is φ = 15890256000.

The previous prime is 20111021197. The next prime is 20111021237. The reversal of 20111021203 is 30212011102.

It is a cyclic number.

It is not a de Polignac number, because 20111021203 - 2⁵ = 20111021171 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is not an unprimeable number, because it can be changed into a prime (20111021803) 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 15 ways as a sum of consecutive naturals, for example, 84048 + ... + 217453.

It is an arithmetic number, because the mean of its divisors is an integer number (1549117276).

Almost surely, 2^20111021203 is an apocalyptic number.

20111021203 is a deficient number, since it is larger than the sum of its proper divisors (4674855213).

20111021203 is a wasteful number, since it uses less digits than its factorization.

20111021203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302254.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20111021203 its reverse (30212011102), we get a palindrome (50323032305).

The spelling of 20111021203 in words is "twenty billion, one hundred eleven million, twenty-one thousand, two hundred three".