21203232232021 has 32 divisors (see below), whose sum is σ = 26332083486720. Its totient is φ = 16661236032000.

The previous prime is 21203232232001. The next prime is 21203232232151. The reversal of 21203232232021 is 12023223230212.

It is a de Polignac number, because none of the positive numbers 2^k-21203232232021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203232232001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71290821 + ... + 71587621.

It is an arithmetic number, because the mean of its divisors is an integer number (822877608960).

Almost surely, 2^{21203232232021} is an apocalyptic number.

It is an amenable number.

21203232232021 is a deficient number, since it is larger than the sum of its proper divisors (5128851254699).

21203232232021 is a wasteful number, since it uses less digits than its factorization.

21203232232021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314185.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21203232232021 its reverse (12023223230212), we get a palindrome (33226455462233).

The spelling of 21203232232021 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-two million, two hundred thirty-two thousand, twenty-one".