121001243 has 4 divisors (see below), whose sum is σ = 132001368. Its totient is φ = 110001120.

The previous prime is 121001239. The next prime is 121001249. The reversal of 121001243 is 342100121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342100121 = 11 ⋅31100011.

It is a cyclic number.

It is not a de Polignac number, because 121001243 - 2² = 121001239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121001249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5500046 + ... + 5500067.

It is an arithmetic number, because the mean of its divisors is an integer number (33000342).

Almost surely, 2^121001243 is an apocalyptic number.

121001243 is a deficient number, since it is larger than the sum of its proper divisors (11000125).

121001243 is a wasteful number, since it uses less digits than its factorization.

121001243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000124.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 121001243 is about 11000.0564998549. The cubic root of 121001243 is about 494.6104379793.

Adding to 121001243 its reverse (342100121), we get a palindrome (463101364).

The spelling of 121001243 in words is "one hundred twenty-one million, one thousand, two hundred forty-three".