21782386158 has 32 divisors (see below), whose sum is σ = 48429330432. Its totient is φ = 6486069600.

The previous prime is 21782386133. The next prime is 21782386211. The reversal of 21782386158 is 85168328712.

It is a self number, because there is not a number n which added to its sum of digits gives 21782386158.

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, 4501798 + ... + 4506633.

It is an arithmetic number, because the mean of its divisors is an integer number (1513416576).

Almost surely, 2^21782386158 is an apocalyptic number.

21782386158 is an abundant number, since it is smaller than the sum of its proper divisors (26646944274).

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

21782386158 is a wasteful number, since it uses less digits than its factorization.

21782386158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9008480.

The product of its digits is 1290240, while the sum is 51.

The spelling of 21782386158 in words is "twenty-one billion, seven hundred eighty-two million, three hundred eighty-six thousand, one hundred fifty-eight".