21786226682055 has 32 divisors (see below), whose sum is σ = 38034440386560. Its totient is φ = 10560915665280.

The previous prime is 21786226682021. The next prime is 21786226682083. The reversal of 21786226682055 is 55028662268712.

It is not a de Polignac number, because 21786226682055 - 2¹² = 21786226677959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21786226682055.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12314520 + ... + 13972109.

It is an arithmetic number, because the mean of its divisors is an integer number (1188576262080).

Almost surely, 2^{21786226682055} is an apocalyptic number.

21786226682055 is a deficient number, since it is larger than the sum of its proper divisors (16248213704505).

21786226682055 is a wasteful number, since it uses less digits than its factorization.

21786226682055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26291671.

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 21786226682055 in words is "twenty-one trillion, seven hundred eighty-six billion, two hundred twenty-six million, six hundred eighty-two thousand, fifty-five".