21111021230203 has 8 divisors (see below), whose sum is σ = 22381999035200. Its totient is φ = 19856030567688.

The previous prime is 21111021230191. The next prime is 21111021230261. The reversal of 21111021230203 is 30203212011112.

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

It is a cyclic number.

It is not a de Polignac number, because 21111021230203 - 2¹⁷ = 21111021099131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111021230903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3996782901 + ... + 3996788182.

It is an arithmetic number, because the mean of its divisors is an integer number (2797749879400).

Almost surely, 2^{21111021230203} is an apocalyptic number.

21111021230203 is a deficient number, since it is larger than the sum of its proper divisors (1270977804997).

21111021230203 is a wasteful number, since it uses less digits than its factorization.

21111021230203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993571241.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21111021230203 its reverse (30203212011112), we get a palindrome (51314233241315).

The spelling of 21111021230203 in words is "twenty-one trillion, one hundred eleven billion, twenty-one million, two hundred thirty thousand, two hundred three".