121202391 has 8 divisors (see below), whose sum is σ = 162175360. Its totient is φ = 80515512.

The previous prime is 121202383. The next prime is 121202407. The reversal of 121202391 is 193202121.

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

It is not a de Polignac number, because 121202391 - 2³ = 121202383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202351) 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 7 ways as a sum of consecutive naturals, for example, 70531 + ... + 72228.

It is an arithmetic number, because the mean of its divisors is an integer number (20271920).

Almost surely, 2^121202391 is an apocalyptic number.

121202391 is a deficient number, since it is larger than the sum of its proper divisors (40972969).

121202391 is a wasteful number, since it uses less digits than its factorization.

121202391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143045.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 121202391 is about 11009.1957471924. The cubic root of 121202391 is about 494.8843602943.

The spelling of 121202391 in words is "one hundred twenty-one million, two hundred two thousand, three hundred ninety-one".