21856887335522 has 8 divisors (see below), whose sum is σ = 32787463706076. Its totient is φ = 10927732766832.

The previous prime is 21856887335489. The next prime is 21856887335567. The reversal of 21856887335522 is 22553378865812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21730784933641 + 126102401881 = 4661629^2 + 355109^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 355412033 + ... + 355473524.

Almost surely, 2^{21856887335522} is an apocalyptic number.

21856887335522 is a deficient number, since it is larger than the sum of its proper divisors (10930576370554).

21856887335522 is a wasteful number, since it uses less digits than its factorization.

21856887335522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710900932.

The product of its digits is 193536000, while the sum is 65.

The spelling of 21856887335522 in words is "twenty-one trillion, eight hundred fifty-six billion, eight hundred eighty-seven million, three hundred thirty-five thousand, five hundred twenty-two".