21933101 has 4 divisors (see below), whose sum is σ = 22008252. Its totient is φ = 21857952.

The previous prime is 21933091. The next prime is 21933127. The reversal of 21933101 is 10133912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11526025 + 10407076 = 3395^2 + 3226^2 .

It is a cyclic number.

It is not a de Polignac number, because 21933101 - 2¹⁰ = 21932077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21933601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37136 + ... + 37721.

It is an arithmetic number, because the mean of its divisors is an integer number (5502063).

Almost surely, 2^21933101 is an apocalyptic number.

It is an amenable number.

21933101 is a deficient number, since it is larger than the sum of its proper divisors (75151).

21933101 is an equidigital number, since it uses as much as digits as its factorization.

21933101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75150.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21933101 is about 4683.2788727557. The cubic root of 21933101 is about 279.9196240386.

The spelling of 21933101 in words is "twenty-one million, nine hundred thirty-three thousand, one hundred one".