21522055606 has 4 divisors (see below), whose sum is σ = 32283083412. Its totient is φ = 10761027802.

The previous prime is 21522055591. The next prime is 21522055651. The reversal of 21522055606 is 60655022512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5380513900 + ... + 5380513903.

It is an arithmetic number, because the mean of its divisors is an integer number (8070770853).

Almost surely, 2^21522055606 is an apocalyptic number.

21522055606 is a deficient number, since it is larger than the sum of its proper divisors (10761027806).

21522055606 is a wasteful number, since it uses less digits than its factorization.

21522055606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10761027805.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 21522055606 in words is "twenty-one billion, five hundred twenty-two million, fifty-five thousand, six hundred six".