121712207205 has 16 divisors (see below), whose sum is σ = 197085792960. Its totient is φ = 64131090048.

The previous prime is 121712207203. The next prime is 121712207219. The reversal of 121712207205 is 502702217121.

It is not a de Polignac number, because 121712207205 - 2¹ = 121712207203 is a prime.

It is a super-2 number, since 2×121712207205² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121712207203) 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, 48879160 + ... + 48881649.

It is an arithmetic number, because the mean of its divisors is an integer number (12317862060).

Almost surely, 2^121712207205 is an apocalyptic number.

121712207205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121712207205 is a deficient number, since it is larger than the sum of its proper divisors (75373585755).

121712207205 is an equidigital number, since it uses as much as digits as its factorization.

121712207205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97760900.

The product of its (nonzero) digits is 3920, while the sum is 30.

The spelling of 121712207205 in words is "one hundred twenty-one billion, seven hundred twelve million, two hundred seven thousand, two hundred five".