291211121121 has 16 divisors (see below), whose sum is σ = 391600542720. Its totient is φ = 192486142800.

The previous prime is 291211121107. The next prime is 291211121161. The reversal of 291211121121 is 121121112192.

It is not a de Polignac number, because 291211121121 - 2⁶ = 291211121057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 291211121091 and 291211121100.

It is not an unprimeable number, because it can be changed into a prime (291211121101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377661 + ... + 851498.

It is an arithmetic number, because the mean of its divisors is an integer number (24475033920).

Almost surely, 2^291211121121 is an apocalyptic number.

It is an amenable number.

291211121121 is a deficient number, since it is larger than the sum of its proper divisors (100389421599).

291211121121 is a wasteful number, since it uses less digits than its factorization.

291211121121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229836.

The product of its digits is 144, while the sum is 24.

The spelling of 291211121121 in words is "two hundred ninety-one billion, two hundred eleven million, one hundred twenty-one thousand, one hundred twenty-one".