221616123356 has 24 divisors (see below), whose sum is σ = 388214736000. Its totient is φ = 110697682032.

The previous prime is 221616123271. The next prime is 221616123371. The reversal of 221616123356 is 653321616122.

221616123356 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221616123356² (a number of 23 digits) contains 22 as substring.

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, 34935521 + ... + 34941863.

It is an arithmetic number, because the mean of its divisors is an integer number (16175614000).

Almost surely, 2^221616123356 is an apocalyptic number.

It is an amenable number.

221616123356 is a deficient number, since it is larger than the sum of its proper divisors (166598612644).

221616123356 is a wasteful number, since it uses less digits than its factorization.

221616123356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13673 (or 13671 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

Adding to 221616123356 its reverse (653321616122), we get a palindrome (874937739478).

The spelling of 221616123356 in words is "two hundred twenty-one billion, six hundred sixteen million, one hundred twenty-three thousand, three hundred fifty-six".