21224521655606 has 16 divisors (see below), whose sum is σ = 31863765660000. Its totient is φ = 10603267234560.

The previous prime is 21224521655593. The next prime is 21224521655707. The reversal of 21224521655606 is 60655612542212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56319455 + ... + 56695061.

It is an arithmetic number, because the mean of its divisors is an integer number (1991485353750).

Almost surely, 2^{21224521655606} is an apocalyptic number.

21224521655606 is a deficient number, since it is larger than the sum of its proper divisors (10639244004394).

21224521655606 is a wasteful number, since it uses less digits than its factorization.

21224521655606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399479.

The product of its (nonzero) digits is 1728000, while the sum is 47.

The spelling of 21224521655606 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twenty-one million, six hundred fifty-five thousand, six hundred six".