21111203203223 has 8 divisors (see below), whose sum is σ = 24129779500320. Its totient is φ = 18093299437440.

The previous prime is 21111203203217. The next prime is 21111203203271. The reversal of 21111203203223 is 32230230211112.

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 21111203203223 - 2¹² = 21111203199127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111203203423) 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, 168065558 + ... + 168191123.

It is an arithmetic number, because the mean of its divisors is an integer number (3016222437540).

Almost surely, 2^{21111203203223} is an apocalyptic number.

21111203203223 is a deficient number, since it is larger than the sum of its proper divisors (3018576297097).

21111203203223 is an equidigital number, since it uses as much as digits as its factorization.

21111203203223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336265657.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21111203203223 its reverse (32230230211112), we get a palindrome (53341433414335).

The spelling of 21111203203223 in words is "twenty-one trillion, one hundred eleven billion, two hundred three million, two hundred three thousand, two hundred twenty-three".