221545661116 has 24 divisors (see below), whose sum is σ = 417541525184. Its totient is φ = 102248619840.

The previous prime is 221545661093. The next prime is 221545661119. The reversal of 221545661116 is 611166545122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221545661119) 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, 2628346 + ... + 2711326.

Almost surely, 2^221545661116 is an apocalyptic number.

221545661116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

221545661116 is a deficient number, since it is larger than the sum of its proper divisors (195995864068).

221545661116 is a wasteful number, since it uses less digits than its factorization.

221545661116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134341 (or 134339 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The spelling of 221545661116 in words is "two hundred twenty-one billion, five hundred forty-five million, six hundred sixty-one thousand, one hundred sixteen".