121560016155 has 16 divisors (see below), whose sum is σ = 201202786080. Its totient is φ = 62596421888.

The previous prime is 121560016141. The next prime is 121560016157. The reversal of 121560016155 is 551610065121.

It is a cyclic number.

It is not a de Polignac number, because 121560016155 - 2¹² = 121560012059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121560016157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139723722 + ... + 139724591.

It is an arithmetic number, because the mean of its divisors is an integer number (12575174130).

Almost surely, 2^121560016155 is an apocalyptic number.

121560016155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121560016155 is a deficient number, since it is larger than the sum of its proper divisors (79642769925).

121560016155 is a wasteful number, since it uses less digits than its factorization.

121560016155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279448350.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 121560016155 in words is "one hundred twenty-one billion, five hundred sixty million, sixteen thousand, one hundred fifty-five".