21102100233 has 4 divisors (see below), whose sum is σ = 28136133648. Its totient is φ = 14068066820.

The previous prime is 21102100223. The next prime is 21102100267. The reversal of 21102100233 is 33200120112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21102100233 - 2¹² = 21102096137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102100213) 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, 3517016703 + ... + 3517016708.

It is an arithmetic number, because the mean of its divisors is an integer number (7034033412).

Almost surely, 2^21102100233 is an apocalyptic number.

It is an amenable number.

21102100233 is a deficient number, since it is larger than the sum of its proper divisors (7034033415).

21102100233 is an equidigital number, since it uses as much as digits as its factorization.

21102100233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7034033414.

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

Adding to 21102100233 its reverse (33200120112), we get a palindrome (54302220345).

The spelling of 21102100233 in words is "twenty-one billion, one hundred two million, one hundred thousand, two hundred thirty-three".