121723265105 has 32 divisors (see below), whose sum is σ = 166846617504. Its totient is φ = 84453359616.

The previous prime is 121723265099. The next prime is 121723265107. The reversal of 121723265105 is 501562327121.

It can be written as a sum of positive squares in 16 ways, for example, as 6057975889 + 115665289216 = 77833^2 + 340096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121723265105 is a prime.

It is a super-2 number, since 2×121723265105² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121723265107) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 542129 + ... + 733041.

It is an arithmetic number, because the mean of its divisors is an integer number (5213956797).

Almost surely, 2^121723265105 is an apocalyptic number.

It is an amenable number.

121723265105 is a deficient number, since it is larger than the sum of its proper divisors (45123352399).

121723265105 is a wasteful number, since it uses less digits than its factorization.

121723265105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191525.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 121723265105 in words is "one hundred twenty-one billion, seven hundred twenty-three million, two hundred sixty-five thousand, one hundred five".