21233101 has 4 divisors (see below), whose sum is σ = 21340000. Its totient is φ = 21126204.

The previous prime is 21233087. The next prime is 21233111. The reversal of 21233101 is 10133212.

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 a de Polignac number, because none of the positive numbers 2^k-21233101 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 (21233111) 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, 53151 + ... + 53548.

It is an arithmetic number, because the mean of its divisors is an integer number (5335000).

Almost surely, 2^21233101 is an apocalyptic number.

It is an amenable number.

21233101 is a deficient number, since it is larger than the sum of its proper divisors (106899).

21233101 is a wasteful number, since it uses less digits than its factorization.

21233101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106898.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21233101 is about 4607.9389101853. The cubic root of 21233101 is about 276.9094700836.

Adding to 21233101 its reverse (10133212), we get a palindrome (31366313).

The spelling of 21233101 in words is "twenty-one million, two hundred thirty-three thousand, one hundred one".