21054782 has 8 divisors (see below), whose sum is σ = 36093936. Its totient is φ = 9023472.

The previous prime is 21054779. The next prime is 21054791. The reversal of 21054782 is 28745012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 751943 + ... + 751970.

It is an arithmetic number, because the mean of its divisors is an integer number (4511742).

Almost surely, 2^21054782 is an apocalyptic number.

21054782 is a deficient number, since it is larger than the sum of its proper divisors (15039154).

21054782 is a wasteful number, since it uses less digits than its factorization.

21054782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503922.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 21054782 is about 4588.5490081288. The cubic root of 21054782 is about 276.1321131147.

Adding to 21054782 its reverse (28745012), we get a palindrome (49799794).

The spelling of 21054782 in words is "twenty-one million, fifty-four thousand, seven hundred eighty-two".