21782610870 has 32 divisors (see below), whose sum is σ = 52286813280. Its totient is φ = 5807746560.

The previous prime is 21782610869. The next prime is 21782610887. The reversal of 21782610870 is 7801628712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137950 + ... + 250190.

It is an arithmetic number, because the mean of its divisors is an integer number (1633962915).

Almost surely, 2^21782610870 is an apocalyptic number.

21782610870 is an abundant number, since it is smaller than the sum of its proper divisors (30504202410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21782610870 is a wasteful number, since it uses less digits than its factorization.

21782610870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118720.

The product of its (nonzero) digits is 75264, while the sum is 42.

The spelling of 21782610870 in words is "twenty-one billion, seven hundred eighty-two million, six hundred ten thousand, eight hundred seventy".