21996733 has 4 divisors (see below), whose sum is σ = 23996448. Its totient is φ = 19997020.

The previous prime is 21996731. The next prime is 21996757. The reversal of 21996733 is 33769912.

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 21996733 - 2¹ = 21996731 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996731) 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, 999841 + ... + 999862.

It is an arithmetic number, because the mean of its divisors is an integer number (5999112).

Almost surely, 2^21996733 is an apocalyptic number.

It is an amenable number.

21996733 is a deficient number, since it is larger than the sum of its proper divisors (1999715).

21996733 is a wasteful number, since it uses less digits than its factorization.

21996733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999714.

The product of its digits is 61236, while the sum is 40.

The square root of 21996733 is about 4690.0674835230. The cubic root of 21996733 is about 280.1900622842.

The spelling of 21996733 in words is "twenty-one million, nine hundred ninety-six thousand, seven hundred thirty-three".