221412441606521 has 8 divisors (see below), whose sum is σ = 241541579484288. Its totient is φ = 201283426078000.

The previous prime is 221412441606491. The next prime is 221412441606529. The reversal of 221412441606521 is 125606144214122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221412441606521 is a prime.

It is a super-2 number, since 2×221412441606521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221412441606529) 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, 26782865 + ... + 34060926.

It is an arithmetic number, because the mean of its divisors is an integer number (30192697435536).

Almost surely, 2^{221412441606521} is an apocalyptic number.

It is an amenable number.

221412441606521 is a deficient number, since it is larger than the sum of its proper divisors (20129137877767).

221412441606521 is a wasteful number, since it uses less digits than its factorization.

221412441606521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61174623.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 221412441606521 in words is "two hundred twenty-one trillion, four hundred twelve billion, four hundred forty-one million, six hundred six thousand, five hundred twenty-one".