21946933 has 4 divisors (see below), whose sum is σ = 22024768. Its totient is φ = 21869100.

The previous prime is 21946909. The next prime is 21946937. The reversal of 21946933 is 33964912.

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 21946933 - 2¹⁷ = 21815861 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21946892 and 21946901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21946937) 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, 38493 + ... + 39058.

It is an arithmetic number, because the mean of its divisors is an integer number (5506192).

Almost surely, 2^21946933 is an apocalyptic number.

It is an amenable number.

21946933 is a deficient number, since it is larger than the sum of its proper divisors (77835).

21946933 is an equidigital number, since it uses as much as digits as its factorization.

21946933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77834.

The product of its digits is 34992, while the sum is 37.

The square root of 21946933 is about 4684.7553831550. The cubic root of 21946933 is about 279.9784549749.

The spelling of 21946933 in words is "twenty-one million, nine hundred forty-six thousand, nine hundred thirty-three".