21930133 has 4 divisors (see below), whose sum is σ = 22011328. Its totient is φ = 21848940.

The previous prime is 21930131. The next prime is 21930137. The reversal of 21930133 is 33103912.

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 21930133 - 2¹ = 21930131 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 (21930131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40191 + ... + 40732.

It is an arithmetic number, because the mean of its divisors is an integer number (5502832).

Almost surely, 2^21930133 is an apocalyptic number.

It is an amenable number.

21930133 is a deficient number, since it is larger than the sum of its proper divisors (81195).

21930133 is an equidigital number, since it uses as much as digits as its factorization.

21930133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81194.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21930133 is about 4682.9619900230. The cubic root of 21930133 is about 279.9069971735.

The spelling of 21930133 in words is "twenty-one million, nine hundred thirty thousand, one hundred thirty-three".