221521316101 has 8 divisors (see below), whose sum is σ = 235096193664. Its totient is φ = 208006906560.

The previous prime is 221521316053. The next prime is 221521316111. The reversal of 221521316101 is 101613125122.

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-221521316101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221521316111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15109455 + ... + 15124108.

It is an arithmetic number, because the mean of its divisors is an integer number (29387024208).

Almost surely, 2^221521316101 is an apocalyptic number.

It is an amenable number.

221521316101 is a deficient number, since it is larger than the sum of its proper divisors (13574877563).

221521316101 is a wasteful number, since it uses less digits than its factorization.

221521316101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234011.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 221521316101 in words is "two hundred twenty-one billion, five hundred twenty-one million, three hundred sixteen thousand, one hundred one".