21272782 has 8 divisors (see below), whose sum is σ = 31940352. Its totient is φ = 10626000.

The previous prime is 21272759. The next prime is 21272803. The reversal of 21272782 is 28727212.

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, 2319 + ... + 6922.

It is an arithmetic number, because the mean of its divisors is an integer number (3992544).

Almost surely, 2^21272782 is an apocalyptic number.

21272782 is a deficient number, since it is larger than the sum of its proper divisors (10667570).

21272782 is a wasteful number, since it uses less digits than its factorization.

21272782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10394.

The product of its digits is 6272, while the sum is 31.

The square root of 21272782 is about 4612.2426215454. The cubic root of 21272782 is about 277.0818614026.

Adding to 21272782 its reverse (28727212), we get a palindrome (49999994).

The spelling of 21272782 in words is "twenty-one million, two hundred seventy-two thousand, seven hundred eighty-two".