21203230011011 has 4 divisors (see below), whose sum is σ = 21203241456432. Its totient is φ = 21203218565592.

The previous prime is 21203230010999. The next prime is 21203230011013. The reversal of 21203230011011 is 11011003230212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21203230011011 - 2¹⁰ = 21203230009987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203230011013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2235596 + ... + 6885081.

It is an arithmetic number, because the mean of its divisors is an integer number (5300810364108).

Almost surely, 2^{21203230011011} is an apocalyptic number.

21203230011011 is a deficient number, since it is larger than the sum of its proper divisors (11445421).

21203230011011 is an equidigital number, since it uses as much as digits as its factorization.

21203230011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11445420.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21203230011011 its reverse (11011003230212), we get a palindrome (32214233241223).

The spelling of 21203230011011 in words is "twenty-one trillion, two hundred three billion, two hundred thirty million, eleven thousand, eleven".