21201100233 has 32 divisors (see below), whose sum is σ = 29685497856. Its totient is φ = 13443288768.

The previous prime is 21201100189. The next prime is 21201100247. The reversal of 21201100233 is 33200110212.

It is not a de Polignac number, because 21201100233 - 2⁶ = 21201100169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21201100033) 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, 5543760 + ... + 5547582.

It is an arithmetic number, because the mean of its divisors is an integer number (927671808).

Almost surely, 2^21201100233 is an apocalyptic number.

It is an amenable number.

21201100233 is a deficient number, since it is larger than the sum of its proper divisors (8484397623).

21201100233 is a wasteful number, since it uses less digits than its factorization.

21201100233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21201100233 its reverse (33200110212), we get a palindrome (54401210445).

The spelling of 21201100233 in words is "twenty-one billion, two hundred one million, one hundred thousand, two hundred thirty-three".