121806411291 has 12 divisors (see below), whose sum is σ = 182009580480. Its totient is φ = 78404126640.

The previous prime is 121806411271. The next prime is 121806411299. The reversal of 121806411291 is 192114608121.

121806411291 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 0 + 641 + 1 + 2 + 9 + 1 = 666.

It is not a de Polignac number, because 121806411291 - 2⁶ = 121806411227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121806411299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233345355 + ... + 233345876.

It is an arithmetic number, because the mean of its divisors is an integer number (15167465040).

Almost surely, 2^121806411291 is an apocalyptic number.

121806411291 is a deficient number, since it is larger than the sum of its proper divisors (60203169189).

121806411291 is a wasteful number, since it uses less digits than its factorization.

121806411291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466691266 (or 466691263 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 121806411291 in words is "one hundred twenty-one billion, eight hundred six million, four hundred eleven thousand, two hundred ninety-one".