21795946 has 4 divisors (see below), whose sum is σ = 32693922. Its totient is φ = 10897972.

The previous prime is 21795931. The next prime is 21795947. The reversal of 21795946 is 64959712.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 21520321 + 275625 = 4639^2 + 525^2 .

It is not an unprimeable number, because it can be changed into a prime (21795947) 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 as a sum of consecutive naturals, namely, 5448985 + ... + 5448988.

Almost surely, 2^21795946 is an apocalyptic number.

21795946 is a deficient number, since it is larger than the sum of its proper divisors (10897976).

21795946 is a wasteful number, since it uses less digits than its factorization.

21795946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10897975.

The product of its digits is 136080, while the sum is 43.

The square root of 21795946 is about 4668.6128560848. The cubic root of 21795946 is about 279.3349266293.

The spelling of 21795946 in words is "twenty-one million, seven hundred ninety-five thousand, nine hundred forty-six".