21782728270 has 8 divisors (see below), whose sum is σ = 39208910904. Its totient is φ = 8713091304.

The previous prime is 21782728267. The next prime is 21782728271. The reversal of 21782728270 is 7282728712.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21782728270.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21782728271) 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, 1089136404 + ... + 1089136423.

It is an arithmetic number, because the mean of its divisors is an integer number (4901113863).

Almost surely, 2^21782728270 is an apocalyptic number.

21782728270 is a deficient number, since it is larger than the sum of its proper divisors (17426182634).

21782728270 is a wasteful number, since it uses less digits than its factorization.

21782728270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178272834.

The product of its (nonzero) digits is 351232, while the sum is 46.

The spelling of 21782728270 in words is "twenty-one billion, seven hundred eighty-two million, seven hundred twenty-eight thousand, two hundred seventy".