21461733 has 8 divisors (see below), whose sum is σ = 31795200. Its totient is φ = 14307804.

The previous prime is 21461731. The next prime is 21461747. The reversal of 21461733 is 33716412.

21461733 is a `hidden beast` number, since 2 + 14 + 617 + 33 = 666.

It is not a de Polignac number, because 21461733 - 2¹ = 21461731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 794879 = 21461733 / (2 + 1 + 4 + 6 + 1 + 7 + 3 + 3).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21461697 and 21461706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21461731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397413 + ... + 397466.

It is an arithmetic number, because the mean of its divisors is an integer number (3974400).

Almost surely, 2^21461733 is an apocalyptic number.

It is an amenable number.

21461733 is a deficient number, since it is larger than the sum of its proper divisors (10333467).

21461733 is an equidigital number, since it uses as much as digits as its factorization.

21461733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794888 (or 794882 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 21461733 is about 4632.6809732594. The cubic root of 21461733 is about 277.8998181195.

The spelling of 21461733 in words is "twenty-one million, four hundred sixty-one thousand, seven hundred thirty-three".