121231231205 has 8 divisors (see below), whose sum is σ = 166259974272. Its totient is φ = 83129987088.

The previous prime is 121231231193. The next prime is 121231231217. The reversal of 121231231205 is 502132132121.

It is an interprime number because it is at equal distance from previous prime (121231231193) and next prime (121231231217).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121231231205 - 2¹⁰ = 121231230181 is a prime.

It is a super-2 number, since 2×121231231205² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1731874697 + ... + 1731874766.

It is an arithmetic number, because the mean of its divisors is an integer number (20782496784).

Almost surely, 2^121231231205 is an apocalyptic number.

It is an amenable number.

121231231205 is a deficient number, since it is larger than the sum of its proper divisors (45028743067).

121231231205 is an equidigital number, since it uses as much as digits as its factorization.

121231231205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463749475.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 121231231205 its reverse (502132132121), we get a palindrome (623363363326).

The spelling of 121231231205 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred thirty-one thousand, two hundred five".