121012291 has 2 divisors, whose sum is σ = 121012292. Its totient is φ = 121012290.

The previous prime is 121012271. The next prime is 121012327. The reversal of 121012291 is 192210121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (192210121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121012291 - 2⁵ = 121012259 is a prime.

It is not a weakly prime, because it can be changed into another prime (121012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60506145 + 60506146.

It is an arithmetic number, because the mean of its divisors is an integer number (60506146).

Almost surely, 2^121012291 is an apocalyptic number.

121012291 is a deficient number, since it is larger than the sum of its proper divisors (1).

121012291 is an equidigital number, since it uses as much as digits as its factorization.

121012291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 121012291 is about 11000.5586676314. The cubic root of 121012291 is about 494.6254909647.

The spelling of 121012291 in words is "one hundred twenty-one million, twelve thousand, two hundred ninety-one".