221856594961 has 8 divisors (see below), whose sum is σ = 222194085120. Its totient is φ = 221519186592.

The previous prime is 221856594959. The next prime is 221856594979. The reversal of 221856594961 is 169495658122.

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

It is a cyclic number.

It is not a de Polignac number, because 221856594961 - 2¹ = 221856594959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221856594896 and 221856594905.

It is not an unprimeable number, because it can be changed into a prime (221856594941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7421701 + ... + 7451533.

It is an arithmetic number, because the mean of its divisors is an integer number (27774260640).

Almost surely, 2^221856594961 is an apocalyptic number.

It is an amenable number.

221856594961 is a deficient number, since it is larger than the sum of its proper divisors (337490159).

221856594961 is a wasteful number, since it uses less digits than its factorization.

221856594961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40895.

The product of its digits is 9331200, while the sum is 58.

The spelling of 221856594961 in words is "two hundred twenty-one billion, eight hundred fifty-six million, five hundred ninety-four thousand, nine hundred sixty-one".