100556216221161 has 4 divisors (see below), whose sum is σ = 134074954961552. Its totient is φ = 67037477480772.

The previous prime is 100556216221121. The next prime is 100556216221169. The reversal of 100556216221161 is 161122612655001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 100556216221161 - 2³⁷ = 100418777267689 is a prime.

It is a super-2 number, since 2×100556216221161² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100556216221169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16759369370191 + ... + 16759369370196.

It is an arithmetic number, because the mean of its divisors is an integer number (33518738740388).

Almost surely, 2^{100556216221161} is an apocalyptic number.

It is an amenable number.

100556216221161 is a deficient number, since it is larger than the sum of its proper divisors (33518738740391).

100556216221161 is an equidigital number, since it uses as much as digits as its factorization.

100556216221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33518738740390.

The product of its (nonzero) digits is 43200, while the sum is 39.

Adding to 100556216221161 its reverse (161122612655001), we get a palindrome (261678828876162).

The spelling of 100556216221161 in words is "one hundred trillion, five hundred fifty-six billion, two hundred sixteen million, two hundred twenty-one thousand, one hundred sixty-one".