121221243 has 48 divisors (see below), whose sum is σ = 207567360. Its totient is φ = 67204800.

The previous prime is 121221241. The next prime is 121221283. The reversal of 121221243 is 342122121.

It is a happy number.

It is not a de Polignac number, because 121221243 - 2¹ = 121221241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 168238 + ... + 168956.

It is an arithmetic number, because the mean of its divisors is an integer number (4324320).

Almost surely, 2^121221243 is an apocalyptic number.

121221243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121221243 is a deficient number, since it is larger than the sum of its proper divisors (86346117).

121221243 is a wasteful number, since it uses less digits than its factorization.

121221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 877 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 121221243 is about 11010.0519072346. The cubic root of 121221243 is about 494.9100173137.

Adding to 121221243 its reverse (342122121), we get a palindrome (463343364).

The spelling of 121221243 in words is "one hundred twenty-one million, two hundred twenty-one thousand, two hundred forty-three".