121011572166 has 16 divisors (see below), whose sum is σ = 254761204800. Its totient is φ = 38214180648.

The previous prime is 121011572161. The next prime is 121011572203. The reversal of 121011572166 is 661275110121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011572161) 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, 530752396 + ... + 530752623.

It is an arithmetic number, because the mean of its divisors is an integer number (15922575300).

Almost surely, 2^121011572166 is an apocalyptic number.

121011572166 is an abundant number, since it is smaller than the sum of its proper divisors (133749632634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121011572166 is a wasteful number, since it uses less digits than its factorization.

121011572166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061505043.

The product of its (nonzero) digits is 5040, while the sum is 33.

Adding to 121011572166 its reverse (661275110121), we get a palindrome (782286682287).

The spelling of 121011572166 in words is "one hundred twenty-one billion, eleven million, five hundred seventy-two thousand, one hundred sixty-six".