21011021030203 has 16 divisors (see below), whose sum is σ = 21493148688000. Its totient is φ = 20533934678400.

The previous prime is 21011021030173. The next prime is 21011021030239. The reversal of 21011021030203 is 30203012011012.

It is a cyclic number.

It is not a de Polignac number, because 21011021030203 - 2⁴¹ = 18811997774651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21011021030243) 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, 32692048 + ... + 33328546.

It is an arithmetic number, because the mean of its divisors is an integer number (1343321793000).

Almost surely, 2^{21011021030203} is an apocalyptic number.

21011021030203 is a deficient number, since it is larger than the sum of its proper divisors (482127657797).

21011021030203 is a wasteful number, since it uses less digits than its factorization.

21011021030203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640458.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21011021030203 its reverse (30203012011012), we get a palindrome (51214033041215).

The spelling of 21011021030203 in words is "twenty-one trillion, eleven billion, twenty-one million, thirty thousand, two hundred three".